Is it illegal to play online poker - No.
As others have mentioned, the UIGEA doesn't affect cashouts, only depositing onto sites. Some believe that the UIGEA will open up
intrastate online gambling sites.
I suggest reading the legislation forum, there's plenty of discussion about the UIGEA. Also there's other stuff on the Internet you can read for yourself and form your own opinions.
Start with
I. Nelson Rose, gaming expert.