DTC is hard to mine, since there is no pool yet (new coin), so it's borderline profitable unless you have a very fast PC. If a pool opens this will be the #1 CPU coin to mine. Can be traded on BTER.
SRC mining still possible, but minimal profit. Can be traded on BTER and Cryptsy.
RVD started just a few days ago, but cannot be traded yet.
QRK mining is almost over, you cannot make any profit mining it anymore.