Snapnames $69 (or $40 from reseller who last for only 4 tried).
Bad success rate.
Pool.com $60 if they get the name ($0 upfront). If more than 1 orders it, it goes to auction
High success rate, very high prices.
NameWinner - Auction before the names drop, expensive, generally (the odd bargoon).
So-So success rate.
I would say thats it for good catchers @ the time.
There is also dropwiz, thefirstname, namefox, domaincatcher , Zuess, GoDaddy, eNom and more.
My order @ the time:
1. Pool
2. NameWinner
3. SnapNames