Which prestige classes do you use?

[Baron Opal]

I love prestige classes, but for my campaign I custom make most of them. However, the alienist, archmage, shadowdancer and ... Dragonmark Heir? have made an appearance mostly as is.

 

[EvilGM]

PrCs used in my latest campaign

Radiant Servant of Pelor
Incantatrix
Master Specialist
Inititiate of the Sevenfold Veil
Ghost Faced Killer
War Hulk
Frenzied Berserker
Warlord of Sif
Abjurant Champion

I won't ban anything outright, I'll "adjust" it a bit.