We've since bought one and love it

I will say though that it does get mostly used by our two and a half year old for alphabet games and Bakery Story which she adores, LOL...
Hamid uses it to read his programming books, so that's been a convenience and we've installed Skype on it as too, which has worked out well.
We've really become a 50% Mac household since you first posted this. I am still working on my Vaio and Nou has her little HP laptop but Hamid is working on a Mac and we have an iPhone, iPod nano, iPad and some generation of iPod touch...
In any case, I think Hamid would tell you it's dramatically improved his quality of life as a programmer simply for the sake of reading on a decent and truly portable screen but I haven't found a way to utilize it for my own work. I guess I'm a creature of habit and really like being on my laptop if I have work to do.
What do you think? Have you been using an iPad for work at all?