How easy is it to convert stuff to Castles and Crusades from other editions? I've been interested in the system since I first heard of it, but I've never really checked it out.
There is a free Quickstart PDF you can DL from RPGnow/drivethrurpg to get a look at all the basics.
Speaking as someone who has actually been using C&C for the last 4 years, converting to C&C is extremely easy. I have done conversion from every version of D&D to every other edition of D&D, except with 4E, with 4E I have only converted from it to C&C.
So in the last 25 years I have converted from basic to 1E, 2E, 3E, or C&C, or from 1E to basic, to 2E, etc... and one of the things I like about C&C is that it is the easiest to convert to.
Like to convert Basic, 1E, and 2E to C&C all you do is switch the AC to a positive value. In C&C to hit and saves is directly related to your level/HD. In most cases Magic Resistance can be converted to SR on a 5%=1 point on a d20 basis. When it doesn't, you make it whatever works for you. For attributes you just use the C&C modifiers instead of the previous editions.
Magic items and spells are almost seamlessly usable. Spells in particular you will likely need to change the casting time and durations, usually that is it. In some cases, like fireball, you may have to decide which area of effect you want to use from which edition. Haste is another possible example, I like to use the 2E version.
3E is pretty simple for me too. There is a longish looking write up available over on the TLG message boards, but when you get down to it it is very easy. The big question you need to answer first, if your going to even want to convert stuff from 3E, is if you wish to use Feats or not. There are some house rules of various ways people have adapted a limited feat system, or you could even use the full feat system with little trouble. You just have to ignore prerequisites, or adapt them to C&C terms.
Or you could use feats as a big guideline, like I do, as types of "SIEGE checks" your players can do. The wizard wishes to maximize his fireball, I assign a base CL of 3 +3 for the level of the spell, for final CL of 6, so they would need to beat an 18 in the SIEGE system to maximize the fireball, and they add their level to their roll. Most other feats can be used as a guideline for similar SIEGE checks. So in C&C a character is only limited to the imagination of the player, what the CK will allow, and the luck of the dice roll. PC's will no longer be limited by lists of feats, skills, or powers.
Castles and Crusades is, in my opinion, the ideal core system to use if you have ever said to yourself, "Well, there are things I like best from every edition of D&D. I wish there was one game that took all those pieces and put it together." C&C is that core game, and it does not break when I take things I like from Basic all the way to 4E, and put them in my C&C. So C&C is a great base to build EXACTLY the game you want, largely due to how flexibly AWESOME the SIEGE mechanic is.
Plus their is a very good chance someone has already written up house rules documents already doing things you may wish to do to make C&C your personally customized game.
So I think C&C is very worth checking out if things I have said in this post appeal to you.
Plus the game itself is very well supported. Go to tr
http://www.trolllord.com/ and see for yourself.
The Monsters and Treasures just ahd its 3rd printing, and has all new covers and interior layout, and a couple of added pieces of art for creatures previously missing illustrations.
The Players Handbook 4th printing will be out in July, in fact it went to printers today. It too has a new cover, new interior layout, 45 new Illusionist spells, and altered Monk and Barbarian classes.
These 2 books are still $20 each at full retail.
By Gen Con "Of Gods and Monsters", written by James Ward, will be out, and is now considered to be a 4th core book of the system, and is priced at $30 full retail.
Gen Con will also finally see the release of the "Castles Keeper Guide", which is considered the third core book of the system. It is priced at $30 full retail as well.
Now realize that even though Of Gods and Monsters and the Castles Keepers Guide are considered a "core" book of C&C that I, and many others, have been playing C&C just fine for the last 4 years without them. So realize that any time you see anyone implying that you need more than the Monsters and Treasures and the Players Handbook, they are completely wrong.
In fact, if you just want to use C&C as the base line of your personally customized RPG, you can use just the PH and get your monsters from your favorite manual from your favorite edition, or your favorite version, from whichever edition contains your favorite version. Same goes for magic items and spells.
Now if you want to learn C&C "as is", then you will only need the PH and the M&T. Its all I have been using to run my game for the last 4 years, along with whichever monster, magic item, spell, or rule I like best from the other versions of D&D.
Now, if there is a specific edition you still love more than all others, and don't have much desire to pick and choose from every edition of D&D, including 4E, because we have been taking ideas from 4E too, then definitely go with the one you love.
Plus I strongly recommend you check out the old school magazines Knockspell and Fight On!. If you end up being like me and use stuff from every edition than you can also choose to enjoy Kobold Quarterly and Level Up magazine. Plus I also recently bought a print copy of "Swords and Wizardry" from Mythmere Games, the same people doing Knockspell. It is a consolidated and better written and presented interpretation of the original supplement books of D&D. Several cool rules versions in that I am thinking of using in my C&C games instead.
That is one potential problem with C&C. If you are not like me, and have tons of books from every edition of D&D (Except 4E, I only have the PH 1), and you really get into the universal freedom of C&C, then your going to have to resist buying everything having to do with D&D, rather than having it narrowed down for you.
So if you go the C&C route your going to have to either be able to afford to buy anything that strikes your fancy, or resist buying all the stuff printed by TSR and WOTC, AND all the stuff printed under OSRIC, Labyrinth Lord, etc... and trust me, there is already a LOT of new stuff out there!
So hopefully you have the personal discipline to control yourself, I don't.