This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
Use the UBB "CODE" tags. On the editing screen, look below the big textarea and you'll see a bunch of buttons; one button says "CODE". Push it to create a set of CODE tags. Put your code in between those tags, and any formatting will be preserved.