I have a HP-Compaq nx9005:Mobile Athlon XP 2400+, 512 MB RAM, Mobility Radeon(R320), etc..
I am running a heavily customized Slackware 10.1, although simply using 10.1 with a little config would do as well. Here are my observations:
1) The Winmodem is a problem... Maybe I could set it up if I had some time, but that is one of a few reasons I keep WinXP that came with the notebook.
2) ATI graphics card is now OK with Xorg, but needs some configuration. I think normal Xorg drivers are better than the ones ATI offers.
3) Suspend features. It worked for only one installation, but unfortunately I messed it up trying to learn more about Linux. I don't know what I do wrong, but OS won't come back after suspend.
4) Touchpad. Once configured, it has some extras which i didn't find in Windows(neither I care, actually
) You can use your two fingers as a middle button, three fingers as left click, things like scrolling are OK too..
5) Battery management is perfect! I have KDE, Fluxbox and Windowmaker as windowmanagers/DE's. When plugged in, I use KDE, and when running on battery, I switch to one of the others. I also use powersaved. At least 20% more battery life than working under Windows...