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They have buckets of these things at the local Zellers here in Toronto.
It can capture your drawings to your PC (plus a ton of other stuff) this might be handy when drawing a schematic that you want to share. The FLY Fusion Pentop Computer Review|Gear Diary
If you don't have a scanner it's pretty handy. Hey for $20 it's an MP3 player too
It'll also remember several hand written pages of your notes. Of course it needs special paper and if you get bored with it you can always disassemble it (tiny camera inside)