I really liked the original game, especially the very hard difficulty since most games of this type are pretty easy, it was a bit frustrating at times but rewarding.
I would like the beta key since I'm sure to test it properly and afterwards properly bug the developers with the suggestions and stuff i didn't like.
This is what i'm waiting for, played D3 beta and haven't been overly impressed, too streamlined for my taste. On the other hand this is a clear improvement over first torchlight without destroying the original idea.