Does it have WiFi ?
I used to use WinMo phones with WiFi around the house as portable home Slingplayers. Porch, sofa, bathroom. Great for the kids, too.
Can also put Skype on them and use them as home WiFi Skype handsets.
Also the ones with handwriting recognition are useful with kids. My daughter learned a lot about writing that way when she was three or four. (She had to write well enough with the stylus on the screen for it to recognize the letters.)
Even games are good on them; keep it around the car if you have kids.