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.
Hmmmm. Can you post your code? I've used modal=true many times an it certainly renders other frames useless (well, okay, so I can move them around under Linux, but I can't bring them to the front or enter anything in them).