Cleric: Low Fortitude saves.

Druid: Low Fortitude saves, Animal Companion advances at half Druid level.

Psion: Gain Psicrystal Affinity as a bonus feat at level 1.

Psychic Warrior: Full BAB and high Will saves

Wilder: Gain an extra two powers known at level 1.

Wizard: Familiar advancement is tied to caster level rather than class level.

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Intimidate: Can use Strength modifier instead of Charisma modifier if it is higher.

Spellcraft/Psicraft: Tied to whichever ability score is that class's primary casting/manifesting stat.

Power Attack: Combat special action rather than feat.

Weapon Finesse: Weapon property rather than feat.