Countless times I've found solutions on the net: I'll try to give back some, by sharing interesting things I'll come across.
HP iPAQ rx5935
My 2007 TomTom-equipped iPAQ is still performing his duties. During its life, it's been used as a mobile wi-fi browser, a lullaby generator for my daughter and, of course, a navigator.
It's even equipped with a nice leather slipcase, but it has a design issue: the power button is left exposed and is really easy to press. I've found it powered on while stuffed in my pouch many times: any other item that casually touches it, may turn it on.