I actually have a Dell Mini 9 as a Hackintosh. Runs OSX and Win 7. Great machine with a 64GB SSD. I love it. I used to wonder about the value of netbooks but now I think it has value.
Regarding multi-function, I prefer to go the single function route. Otherwise, you compromise on almost everything for the benefit of one device. I will admit though, that the iPhone turns out to be a great multi-function device for web browsing, email, calendar, apps, streaming radio, GPS, Kindle, etc. Note that I did not say phone. The phone part is crap. Blackberry does it better.
What you're looking for isn't an ereader. It's a laptop. And there's a lot of options now. When you add all those functions you want, it's not just an ereader.