I have recently developed a bright yellow "sunspot" on the screen of my Treo 300. It's about the size of my little fingernail and blocks out all data beneath it. Anyone ever see anything like this before? Also, I can finally upgrade to the 600 this month under Sprint's pull-ahead plan, cuz I've owned the 300 for 18 months, but I keep hearing of some kind of model upgrade soon. My 300 works just fine, it's just that the sunspot is annoying. Should I hold out a while longer and see if we get an upgraded 600 soon?