This should be a pretty easy app to develop. You can use one of the many stuck pixel applications as a template. Here is something that was made for a cell phone...

http://forum.archosfans.com/viewtopic.p … 66#p204066

...and do it for Chumby. Sadly, Chumby says that 2 dead pixels are within spec and not covered under warranty. I have two, and one is really annoying. I'd like to try a dead pixel screen massager overnight to see if I can get it unstuck, but there doesn't seem to be an easy way to do it.

EDIT: Such apps are available for the PC and many other platforms. They're designed for pixels that are stuck-on when they shouldn't be. No guarantees, but it *can* help in some cases.