I think the decline of PDAs has a lot to do with the large number of smartphones on the go, I changed over to UIQ a couple of years ago from my dedicated PDA and was fairly happy with it.

Another reason I would say is that Pocket PC OS is a joke, it's absolutely pathetic - my three year old Zaurus' OS was lightyears ahead. Despite packing a 612Mhz processor, my X50V is sluggish and often needs resetting, by default pocketpc2003 has no battery meter on the display nor a proper task manager. It's a shame because the X50V hardware is superb, it has a beautiful VGA screen, BT, wi-fi, 612Mhz processor, SD and CF slots etc- the closest phone is the HTC Universal, which is nearly double the weight, slower and no CF.

John