I use an imate pda2 with an old imate pocket pc as a backup.
Its used for mobile email/internet,phone,sms,note taking on phatpad and an engineering program for trigonometry,calcs,plus I find the camera pretty useful for quick snaps of things.....sometimes I use it to listen to music and for showing funny vids off the internet to workmates.
I love these all in one devices,if it was just a pda,I doubt I would use it....they are quite fragile though,and have rooted quite a few of them.
I'm actually eyeing up another one at the moment,an O2 XDA flame which has a 3.6" vga screen,GPU,tv out,better camera,3G blah blah blah,but have spent a bit too much money on toys lately and will probably wait a bit.
I can't stand most of the newer pda/phones with their silly sub 3 inch screens....it sort of defeats the purpose of using one over a normal phone,a couple of people at work have nokia N95's which are an awesome device,but have a screen thats too small and dont have screen qwerty keyboard,only a normal T9 type KB which takes me about half an hour to write a sentence.
