I had plenty to say, but happily others have already said it.
I will reiterate one point though . . .
Aaron2 said:
Ok, now I have a question, if a 3 pound sword "feels" like a 7 pound sword, what the heck does a 7 pound sword "feel" like?
This is just asinine. A three pound sword, by definition, has to feel like a three pound sword. That's what it is!
A 3 pound longsword will feel like 7 pounds to just about everybody, actually. (Some may not notice it, though, because with enough strength, 7 pounds would feel like nothing at all. I just am not one of those people, I need a lighter blade like the katana.) You have just proven, though, that you have obviously never wielded a real sword.
Allow me to demonstrate, and then I'll be back to other more important discussions. First off, EVERYTHING in the books is inaccurate by actual weight, as it is all based on encumbrance. This has always been the case in D&D, after all, they just didn't clarify it this time around.
Anyway, to prove my point about 3 pounds feeling like 7 . . . Well find a barbell. A standard 45 pounds one will do nicely. Now pick it up by the middle, dead lift it with two hands. Simply enough, eh? Well, should be for most people anyway. Now put it down and grab it by the end about one foot in. Try to pick it up now. You'll only be able to pull that off if you're REALLY strong, and even then, I guaran-damn-tee it will FEEL like MUCH more than 45 pounds (closer to 100 actually).
The reason for this is simple physics as it turns out. The further the items center of gravity and balance is from the point you're holding it, the more it weighs relative to you. If you hold a sword straight down, gravity has less an effect because it's balanced by your own position to the ground. Swing it out, though, and gravity will grab it at the other end, resulting in a type of tug-o-war. THAT is why things feel heavier than they actually are, and that's why my swords feel heavier. The longsword IS point-heavy, mind you, but the katana has perfect balance. This actually demonstrates the point better.
The best sword you could have? Technically, the two-bladed sword, as all of it's weight is in the center right where you grab it, meaning it could potentially be faster than any other weapon in existence. This is simply dangerous, and that's why such weapons were rare (if they existed at all).