Right, I have Ubuntu 8.10 working pretty well-the touchpad, some of the shortcut keys, and networking are all fine. Haven't yet tested the webcam and mic. No bluetooth at the moment though.
Here is how I did it:
1/ Downloaded Ubuntu 8.10 ISO (
www.ubuntu.com)
2/ Install UNetBootin (I got this from the Ubuntu Eee site, although I'm sure you can find it elsewhere)
3/ Plug in your USB stick, and run Unetbootin, selecting the ISO you just downloaded. Wait a while!
4/ Plug the USB stick into your Eee. In the BIOS, tell it to boot from it (should be able to do this by reordering the hard drives).
5/ Install Ubuntu as you normally would from a Live CD. I installed to an SD card, but nothing should change should you choose to install to your SSD.
6/ Reboot into your new install of Ubuntu! The wireless drivers won't work.
7/Follow the remarkably easy instructions here <
http://www.array.org/ubuntu/setup-intrepid.html> to install Adamm's custom Linux kernel.
8/ Boot from this-your wireless networking should now be working fine
This took me about half an hour, really easy and very chuffed with the results. I also installed Ubuntu Netbook Remix, which is so far very glitchy and almost unusable; I would recommend waiting a while to bother with it.
Also, if you are installing to an SD make sure it's a big one. I installed with a 512mb swap file, and now have less than 1GB of free space on it (this with a 4GB card). If you are installing to the SSD you shouldn't have an issue, as long as you don't try to dual boot with anything else large.
EDIT: Just turned of Compiz and Netbook Remix is now awesome and not glitchy in the slightest. Here's how.
1/ Follow these instructions to start with when installing it, as they will give you all the packages you need. DO NOT do it's final command to reset though.
http://www.ubuntumini.com/2008/10/installing-ubuntu-netbook-remix.html
2/ Reboot the Eee.
3/ Then go to preferences/appearance, and turn off all visual effects (set it to "none"), and set the theme to "human-netbook".
4/Delete the panel at the bottom of your screen. Get rid of the menus on the top panel (these will be included in the Netbook Remix desktop).
5/ Hit alt+f2, and run "netbook-launcher" then "maximus". This will give you the Netbook Remix desktop.
6/ Go to preferences/sessions, and add maximus and netbook-launcher to your startup programs. You will now boot to Netbook Remix
EDIT: Got webcam, bluetooth and the microphone working. Webcam and bluetooth done through the BIOS, and the microphone involved fiddling around cluelessly with the sound settings!
Piccy:
So, all in all:
Pros:
"Feels" faster than Windows.
Netbook Remix really well tailored to the small screen.
Generally uses smaller files than the Windows equivalent.
Looks pretty

Easy to use.
Surprisingly easy to set up (compared to my previous forays into Linux).
Less bloated than XP
Cons:
The hotkeys (ie the ones above the keyboard) don't work.
Webcam and bluetooth must either be turned on or off in the BIOS-can't be toggled once in the OS.
Slightly shorter battery life (on a full charge mine projected 4.30 hours compared to 5.30 hours on Windows). I assume this is due to the "always on" status of the Bluetooth and Webcam.
Takes some setting up; not too tricky, but slightly time consuming-I've spent about 3 hours in all on it, and it's now working the way I want.
All in all I'm happy with it. I currently have Ubuntu NBR on a 4gb SDHC card, and Windows on the SSDs, and think that I will leave it that way for now. The SD card is big enough to allow me to do all my work in Ubuntu, and I have Windows there if I want to play a game or something. I don't need room for music, as anywhere my Eee goes, so too does my MP3 player!