What do you use as an exchange to buy bitcoins? Have you just been mining for a long time so you've accumulated a bunch? Do you use Mt. Gox?

Give Coinbase.com a try - you an connect any U.S. bank account to buy/sell bitcoin. (A YC company).

As it does for most Bitcoiners, just gotta be careful how you use Dwolla now, apparently, unless you don't care if they close your account any more.