Personally i went for the aspire one with netbook remix, everything works, pretty quick and best of all no moving parts so can take a lot of abuse. The atom is nice and the speed of the SSD isnt really an issue.
Also get in touch! wanna pick your brains! and congrats as well if you didnt get my other msgs.

Go for something with a celeron or atom.

A word of warning: DON’T USE EXT3, or you’ll find that the blocks allocated to the journal become unreadable in less than a year.

Specific points:

The keyboard is tiny, but you get used to it. I have huge hands, hands that other people with big hands feel compelled to challenge to see whose is bigger; I’ve only lost those challenges once.

4 GB is barely enough unless you’re sticking to a fairly stock install, adding a handful of programs, and maybe doing development on a few small pieces of software. You definitely can’t fit a bunch of apps on there on the off chance that you’ll use them, there just isn’t room.

The trackpad buttons are pretty bad, but I used gestures and multi-finger taps so much that I barely noticed.

The video card was adequate for Compiz-type things, but apparently performance was better in Hardy than it had been in Intrepid. I never tested Jaunty with it, but hear that the card in the 900A was a good supported one and not one with all the reported Intel problems. I don’t know how it is with other distros.

FBReader is very nice with it. You can even do rotation and hold it like a book.

Overall, I would recommend getting it if it’s the 16GB+ model, otherwise I would think very hard about trying to squeeze everything you might want into 4 GB.

I have a 700, and one of the 90x series. both have the same keyboard and I have to admit that I think it is the weak element in the system. That does not mean that it’s a bad system, just a week point as far as I am concerned.

If you are comfortable with the 900A keyboard, go for it. If it feels cramped, go up to one of the 1000 series devices, or look a tan Acer Aspire One.