Any other alex owners out there so we can share impressions? I got mine last week and have used most of the built-in apps.
I can say that if your touchscreen freezes up, press the reset button -- it's on back, above and to the left of the mini-sd card. Then press the power button so the Alex will power up again. If that doesn't work, your battery may be used up. Recharge it and try again.
This happened to me twice and I'm not really surprized. I am so impatient I freeze Windows PC's all the time, only use linux and mac as a consequence. The first time it froze, I didn't notice it for awhile, and the battery ran out, so I needed to recharge it. The second time I pushed the reset button right away, and it worked.
Now that I have the hang of the buttons, and am not randomly pressing them I haven't had any problems.
I feel like a tree falling in the middle of the forest, since I'm not sure anyone is out there to hear me, so will stop now.