You should try Blockchain.info's My Wallet. They allow you to spend unconfirmed outputs, which means that you can spend coins as soon as you receive them.

Most services do require deposits to confirm a number of times. Generally, one confirm is 10 minutes, but this can vary!

Are there any margin trading platforms for bitcoin that are still operating? I've heard about the Bitcoinica hack, but are there still margin trading sites operating today? (that hopefully has better security measures!)

Nice vanity address!

Just heard the beep - would like to take this moment to thank you again! :)

Thanks so much! I've already purchased some bitcoins, but if that's OK my address is 1AGsq8WcbC4NsES8AwTxkR8JGvNUUFBoUs

See if you can decrypt my latest encryption algorithm..


:)

BitZino is pretty trustworthy in my opinion. There's a lot of bitcoin gambling sites that turned out to be scams or were "hacked".

Plus, all html5! 

Hmm, ASICMINER is mining with their own developed ASIC chips instead of selling it, so you have manufacturers going both ways. It's very profitable being the first to ship, but future returns are unpredictable because of difficulty.

From what I read, your "Total time logged in" will need to be four hours, and you also need to make five posts here.