Goodbye, Rolodex, desk calendar, appointment book and notepad. Hello, palmtop. If you don't have one, you've probably been tempted; if you have one of the original Palm Pilots or Windows CE devices, it may be a good time to upgrade. Keep in mind that more palmtops have invaded the market, so picking one has gotten more complicated. We'll guide you through their ups and downs, and help you answer the ultimate question-Palm or Pocket PC?