Has anyone tried the Reader bag from The Pouch?
http://www.thepouch.com/sony-prs-500.html

Yes. I have one and have used it for almost as long as I have had the Reader.

There is a full discussion about it at http://www.mobileread.com/forums/showthread.php?t=7821&highlight=pouch

Sorry for the delay in answering, I just found the thread now.