[kvs]

Searching on Twitter yields quite a bit of results for "ipad pre-ordered" May be someone can use the API to get an exact number.

[potatolicious]

The majority of iPad buyers are going to twitter about their purchase?

[Psyonic]

We don't know, but it wouldn't surprise me if the early adopter crowd has a lot of overlap with the twitter crowd. That said, I don't think it's worth trying to estimate sales that way