pretty sure that epic spellcasting requires a bit more than just being able to take epic feats....
yep, here it is:
[spoiler]
Epic Spellcasting [Epic]
Prerequisite
Spellcraft 24 ranks, Knowledge (arcana) 24 ranks, ability to cast 9th-level arcane spells. OR Spellcraft 24 ranks, Knowledge (religion) 24 ranks, ability to cast 9th-level divine spells. OR Spellcraft 24 ranks, Knowledge (nature) 24 ranks, ability to cast 9th-level divine spells.
Benefit
You may develop and cast epic spells. If you are an arcane spellcaster, you may cast a number of epic spells per day equal to your ranks in Knowledge (arcana) divided by 10. If you are a divine spellcaster, you may cast a number of epic spells per day equal to your ranks in Knowledge (religion) or Knowledge (nature) divided by 10.
Special
If you meet more than one set of prerequisites, the limit on the number of spells you may cast per day is cumulative. [/spoiler]
also, note that the epic spells/day is your RANKS divided by 10, not your modifier. people tend to forget that