So I find the concept of Proof of Stake interesting.  There are tons of alt coins out there, but only a few support POS.  I'm looking into mining one and am gathering information.  Here's what I have so far.

PPC: SHA based, 30 days until you can attempt POS blocks, 90 day cap, effect 1% gains from POS per year
NVC: scrypt based, 5% POS gains per year
YAC: scrypt, unknown gains, also CPU friendly
BTG: scrypt, unknown gains

Anyone have any more info to add about these coins? Bitgem seems to have active development.  They are adding something about type, cut, clarity???  I'm a bit confused on what that's all about.

YAC seems to have development on a branch by a different developer, but no binaries the last time I looked.