I'm typing this on my netbook. I picked it up a few days ago. I looked t all of them and wound up with an Acer Aspire One. They all have pretty much the same features. I went with the Acer because it has the closest thing to a real keyboard. The Asus has only one shift key, the HP is cramped, the MSI felt awful and the Dell seemed like it would fall apart after a short period.
After I bought this, the first thing I did was remove XP and install Ubuntu 8.10. Everything on the netbook worked with no tweaking (wifi, sound, storage cards, webcam, 3d video, etc) Then, after using it for a while, I installed Ubuntu Netbook Remix on it. UNR made the whole user experience much more enjoyable. (pic below)
I use it mostly for email and surfing Pelican. But, I have also found that I've been using it a lot for work. VPN client, SSH, RDP and a USB aircard lets me take this thing everywhere and be available at a moments notice. This thing fits easily into the glovebox of my 951, so I don't have to worry about leaving a laptop out in the open.
So far, I'm very pleased.