yep that sounds about right Windows CE, i have about three or four versions on the ipaq's, i have been collecting them off ebay after dad got some, one is usb so not really want i want but the others are the old serial link ones, just need to find what version windows CE. and find how to get the Dev kit, and hopefuly i can use C# or at a push VB.
the phone one isnt CE its a odd one not sure what it is now. anyway the PDA's as data loggers and mini control units would be good! especially as you can sync to a spread sheet on a pc. long term plan is too have the temp's and humidity and time they were taken (from ds1307) all logged, might also be cool to be able to change the incubator settings via the PDA and have the values put into the pic eeprom in case the bat goes or the link is interrupted. i normally pay around 3-£4 each for the older ones with dead bats. but you dont need the bat or can get new bat for around £5, i just thought i could do some really cool projects with it, they even have infra red link and some have bluetooth and wifi