Shin Okada said:
Maybe you guys are misunderstanding. I am not saying that there are, say, spells per day table for a 24th-level caster.
No, I'm not misunderstanding you. My post was directly related to the practised spellcaster feat - not the original question.
To answer the original question, my understanding of the rules is that caster level continues to increase with every level that increases a character's spellcasting ability - epic or not.
Spells known (for spontaneous casting classes like Bard, Sorcerer, etc) stop once the player has accumulated 20 class levels in a certain class
OR 20 levels through a combination of base class levels and levels in which the special ability "+1 existing spellcasting class" is granted.
Spell slots stop increasing once the player has accumulated 20 class levels in a certain class
OR 20 levels through a combination of base class levels and levels in which the special ability "+1 existing spellcasting class" is granted.
I think that is about as clear as it can be stated. It may not be right according to a few sources because the wording is poor in many places because they seem to use words interchangeably that shouldn't be used.
Under my understanding of the rules, Practised Spellcaster Feat has no impact whatsoever on any of the above since the Practised Spellcaster Feat increases caster level only and neither spells known nor spell slots granted. The only thing that effects spells known and spell slots granted are class levels (and the "+1 existing ..." special ability in some PrC classes - not caster levels. [Again, under my understanding of the rules]