The 400d is nice, but on a practical basis, it really isn't going to give me anything I can't get with my 350d. My hard drive is already unhappy with 8mb RAW. It would go on strike with 10mb!! Besides, I want to know how well the sensor cleaning works before I took the bait. Also, I only use the screen to verify proper framing and check any egregious exposure errors. Otherwise, I don't really use it. I'll be happy for a couple of more years with my plain little 'ol XT!
Dirk