So, someone mentioned that it might be easier to just place class fixes in a seperate thread from the large groupings for commentary, so here's my Fighter fix. I was aiming for higher Tier 4, on the theory that classes tend to be a little stronger than their designers realize (so it may end up Tier 3 just because of things I don't notice).
I think we should use the fluff as a guide. The fluff says fighters should be capable warlords and guards, as well as frontliners. Plus, they're supposed to be relatively flexible and have special abilities related to feats (I personally think most feats don't need changing, the larger issue is that Fighters get feats instead of class features when generally speaking class features will be better). I think Fighters should be simpler to play than Martial Adepts, but also be good at generally being tough and strong, and have some options to work with, both in and out of combat (though obviously they're stronger in than out). And they should be flexible. So, with that in mind, let's try this:
Fighter
Full BAB, Good Fort, d10 HD, 4+Int skills
Class Skills: As currently, plus Sense Motive, Spot, Listen, Profession, Sense Motive, Knowledge: Nobility and Royalty, and Knowledge: History
1: Bonus Feat, Weapon Aptitude
2: Bonus Feat
3: Art of War
4: Bonus Feat
5: Adaptable Feat
6: Bonus Feat
7: Battlefield Recon
8: Bonus Feat
9: Uncanny Dodge
10: Bonus Feat, Adaptable Feat
11: True Grit
12: Bonus Feat
13: Brace for Impact
14: Bonus Feat
15: Adaptable Feat
16: Bonus Feat
17: Improved Uncanny Dodge
18: Bonus Feat
19: Fearless
20: Bonus Feat, Adaptable Feat
Bonus Feats: As currently
Weapon Aptitude: As the Warblade ability.
Art of War: Fighters train extensively in the basic arts of combat. Add 1/3 your Fighter class level to all opposed Trip, Disarm, Bull Rush, Sunder, Grapple, Feint, and Overrun checks.
Adaptable Feat: Fighters train to be adaptable to the situation. A 5th level Fighter may chose one feat from the Fighter Bonus feats list or any skill boosting feat that he qualifies for, but this feat is special. It may not be used as a prerequisite for any PrCs, nor may it be used as a prerequisite for any other feat except for other Adaptable Feats. At any time, a Fighter may spend one hour practicing and meditating. At the end of this time, he may change his Adapable Feat to any other Fighter or Skill Boosting feat he qualifies for. The Fighter gains a second Adaptable Feat at level 10, a third at 15, and a fourth at 20.
Battlefield Recon: Fighters battle against a great many foes, and learn to identify them quickly. A Fighter of 7th level or higher may add his class level to all Knowledge checks to identify creatures, and always counts as trained in any such knowledge check.
True Grit: Fighters must learn to tough it out under fire. A Fighter of 11th level or higher may add his constitution bonus to any save he has to make.
Brace for Impact: Fighters learn to shrug off incredible injuries. Once per encounter, a Fighter of 13th level or greater may, as an immediate action, gain a number of temporary hitpoints equal to his Fighter level times his constitution score. These hitpoints last until the end of his next turn.
Fearless: A high level Fighter has seen it all. At 19th level, the Fighter is immune to fear.
Note that I'd also like to see certain feats get stronger if you have Fighter levels, for example Dodge gives +1 AC against a single target, and an additional +1AC per four Fighter levels that you have, and Shield Specialization gives an additional +1 AC for every two Fighter levels you have.
JaronK