There's an extensive review and guide to hacking the Eee PC on Ars Technica. There was also a discussion on TWiT 121 with Patrick Norton being the skeptic and Wil Wheaton Harris willing to give it a chance. I think it's the most interesting (new) computer $400 can buy.
I haven't had the opportunity to explore it any further, I went to the SIA dinner with John Cleese as the guest comic. Rather funny guy :-)