Randolpho said:Hmm....
I'm afraid I have to agree. No feat should grant additional spells.
Not even Extra Spell, from T&B?
Re Spellcasting Prodigy: as said by others, it fails the "would everyone take this feat" test. The fact that they put so many restrictions on who can take it (DM approval necessary, only at character creation) just points to the fact that it's very good. There aren't that many ways to boost spellcasting power, especially save DCs.
Furthermore, these restrictions are meaningless in practice. Either you allow someone to the feat, in which case you have a potentially overpowered spellcaster, or you don't allow it, which is just the same as banning the feat. So it doesn't solve anything.