Tendraw has a server too busy message at times. Another thing I want to point out that I believe is severely hindering their success is they have a policy that you need 5mBTC on an address before they will let you play for coin. First off, this cuts off most the new folks, well, all of them, turns them off the site real fast and if they aren't then, when they see how few folks win, it will versus a site that gives something, even if it is a little... all the time. Secondly, for the seasoned folks, many people like to use different address' for payments so they can keep track of where the money is coming from. This makes it so they really can't do that either, because any new address they gen up are unuseable there until they get coin on it. anywys.
And I was getting that message on addresses that had well over 0.005 BTC. They might have fixed that part of it now... but ya, frustrating site.
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bitcoins.so is gone 404
It is up for me at the moment. Maybe it went down while testing a new game he is working on: http://test.bitcoins.so/
cointicket is also still down for maintenance. Its been more than a week now I think.