I bought mine on UK launch day.
If I could use it more, I would... Basically, because the Senior* Mac Support Specialist* at my work spent all day on Break.com and youtube on a MacBook Pro that he should've given out to a user, the whole Desktop Support team has been told to not use separate equipment at our desks.
Which sucks, I'd loaded a bunch of printer repair pdfs onto it and was also using it for quick note taking, but nevermind...
I read books still on there, watched the Scissor Sisters gig on the iTunes Live app the other night, which for something streamed, was amazing quality, I do most of my web surfing on there and watch shows I want to catch up on whilst I'm on the bus to work. It's great for email still too.
I see myself using it for lots more, if you could use the photos app to help manage your iPhoto/Aperture library, it'd become so much more awesome! Also, 4.0 will make it that little bit more serious for those naysayers.
My 3 year old nephew calls it my 'big iPhone' and loves it. We read Toy Story together on it, the first time he's kept attention for me to read a few pages to him, so I love it for that too.
Oh yeah, the asterisks... *Senior - there's only one Mac support Specialist, so that's a tautology. *Specialist - this guydoesn't care about users workflows and the minute they have a problem during it, he says their workflow is the problem, and he wouldn't know a kext if it bit him on the arse and he can't even check logs to verify whether a user is experiencing numerous kernel panics or just an application crashing. So this is a misnomer.