Thanks for the reboot tip. It has been 3 weeks and today the iPhone started going really slow. For instance, the slider took about 4 seconds to move AFTER I swiped my finger across it. So, I did the reboot, and I am back to normal operation.
I have maybe 1G used on the 8G system. I do use just about everything on the iPhone. Recently though I got mockdock up and running and was playing the trailers and I noticed the play got ahead of the buffering process and then I noticed the slide to enter was acting real slow. The reboot fixed the slider - but mockdock trailers still have problems playing - when I play the operation goes ahead of the buffering. Must be another bug.