I was watching Photoshop User TV today and Scott Kelby mentioned a new TSA rule for people traveling with DSLR's. He said he was asked to remove his camera from the bag, and place it in a plastic bin to go thru the X-ray machine. I think this rule was originally for video cameras, but now it's for DSLR's as well. Just a warning to those traveling, keep a close eye on your gear!
You can read about his experience, and what others had to say about it on his blog.
http://www.scottkelby.com/blog/2007/archives/587