Flexcoin announced a security breach today, so: Bump. Guys, using or telling people to use an Online Wallet Service is Not Okay. Not MyBitcoin, not Flexcoin, not StrongCoin, not Coinbase. The only reason a web site should ever have access to your bitcoins is if that website sold them to you, in which case you should transfer them to your own wallet prompty, or if you are using them to pay that website for something, in which case you shouldn't be expecting them back.
You do realize how sites like StrongCoin and Blockchain.info work, right? You keep control of your keys, not them.
Originally in this thread, it seemed like there were folks who weren't wanting to make this distinction. It's an important one though, and one that still needs to be pointed out. A site you interact with where you keep your own keys is still a risk (they could potentially change their code to access your keys,) but on a far different level than one where you don't.
And if the claim is that none of them, even those, are worth using, then I'll it should be asked again:
How do you spend bitcoins away from home without using a site like that, or an app (subject to the same issues?)
It's all a risk calculation. Keep the bulk of your coins in at least one offline savings address, and only keep what you can afford to lose on anything that's not a full node.
All that said... I do agree that keeping coins in an exchange or "bitcoin bank" is just begging for trouble.