Good feats overall, but I think that Power in the Blood is pretty much useless. Prodigal Spellcaster gets you the same thing, pretty much, except it doesn't deal damage to you.

Sneak Attack Focus, does it 1) increase sneak attack or does it 2) add extra damage when you make a sneak attack?

1) This could be lovely to qualify for things earlier. This also lets you get more benefit from ambush feats/abilities...

2) Icky, but nice when combined with the Penetrating Strike ACF (IIRC, That's the name) where you get half sneak attack vs Undead, with +1d6 now. Could also be nice when something negates your sneak attack damage and not the sneak attack itself, for example Warforged Fortification. It's also good if you've got something that converts your sneak attack damage type or using an ambush feat.

I am of the same school of thought, more feats makes it fun to build characters. It also makes certain feats more usable, of course...