New kid on the block, MicroHash
So in the middle of the night I stumbled into www.microhash.net, and noticed that it didn't even have 500 users yet. It had just opened and was one day old at my time of sign-up. It's hard to resist the "Sign up and get 10 kH/s for free." As I gave it some thought and started to embrace my inibitions, I decided to put a little in to upgrade my kH/s. Now cool thing is that they let you purchase KH/s individually, but I don't know if it's rate is decent in the eyes of other cloud miners. My order is at the bottom, but I put in 1000 kH/s to give people a good idea of the pricing for someone wanting to seriously investigate it with risk.
So far it's day five for me having the account, I have cashed out 33% of my input, and still have a small available balance in their payout wallet available. You can use your payouts to pay for more hashes directly too, pretty nifty. Honestly there isn't much to explore, it's a small site, and they only offer bitcoin. I also like how simple they are though because it's so simple it's idiot proof.
Their claims are pretty big about their returns, (7-17 days for profit!), but so far on my end they are technically meeting their claim. I would like to hope they are around to stay because they are making some big promises.
If you're thinking about trying it out, it doesn't hurt to make the account and have the satoshi accumulate from the from the free 10 kH/s. You can add '?ref=444' to the end of any microhash address to use my referral if you'd like.