Alright, for some reason the boards are really slow for me so I'm not sure I'll be able to answer as often as some would like--sorry about that.
@Tzarevitch
The Shugenja looks pretty similar to the OA version without the OA nuance. There are orders/families your character can belong to but in terms of mechanics I can't see an immediate difference (Elemental Focus is only +1, but that's in line with the 3.5 changes).
The Sacred Fist is actually readable (go page layout)! It does not have its own spell progression, 8 of the 10 levels add to pre-existing caster levels. Monk abilities, like unarmed damage dice, AC bonus, and movement are also progresssed. You pretty much need to be a Cleric/Monk to meet the prereqs for this class and you'll advance elements of both classes. At 10th level it gets Inner Armor, which adds +4 to AC and saves 1/day for a number of rounds equal to Wisdom modifier. Sacred Flame is usable 1-2/day and adds fire damage to your unarmed strike. Damage equals class level + Wis mod.
Hospitaler makes sense! 7 of 10 levels advance spell casting, there is no turning, lay on hands is there and you'll get 3 feats total from the class. With the changes to the Paladin in 3.5 you're actually giving stuff up to take this class now, which makes sense.
Pious Templar looks similar to its old version, except for the changes already noted. Level 1: Mettle, 2: Smite 1/day, 3: DR 1/- and Weapon Specialization, 4: Bonus Feat, 5: -, 6: Smite 2/day, 7: DR 2/-, 8: Feat, 9:-, 10: Smite 3/day. Spell progression is a little faster than Paladin's.
@HighlandsBear
They still cast holy sword. In fact, they have the Paladin list (minus Law spells) plus a few spells, like heroism and protection from law. They can remove fatigue, smite evil, break enchantment, get divine grace, and are resistant to compulsion and charm effects. There are also rules for ex-Paladins, which look like the Blackguard rules.
@Bill
Seeker of the Misty Isle is an elf prestige class. Once Corellon poked out Gruumsh's eye, Gruumsh took revenge by stealing the Misty Isle, a beautiful elven community. The class grants decent spell progression (8/10), 2 extra domains over time (Magic and Travel), and a few movement and divination powers.
Again, don't have the 3.0 books to compare but the Divine Oracle looks the same--not sure Trap Sense is needed on a Cleric but it makes sense theme-wise.
@Michael
Choose a domain. You can swap prepared spells for spells from that domain just like swapping for cure spells. You can take it multiple times (once for each domain you have).
knowledge (religion) 4 ranks, nonevil alignment, ability to cast any cure spell. It's worth noting that Spontaneous Wounder also exists, but that's probably not going to be as popular.