Boosting Casting Stat

[cartejos]

What ways exist to boost your effective caster stat for bonus spells. All I can think of is Blood of Siberys Alternate Class Feature. Are there any others?

[Kaleph]

I know 3 feats:
Spellcasting prodigy (PGtF)
Sherem-lar sorcery & sherezem-lar sorcery (ghostwalk).

The last ones are only for sorcerer.

Then of course races and templates that do actually increase your casting stat.