I'm setting up fluxbox on a debian virtual machine:
aptitude install x-window-system aptitude install fluxbox aptitude install firefox
This is a great setup - so simple and lightweight, you really can't go wrong! I installed fluxbox onto a 2GB CF card and its working very well. The computer has 256MB of RAM and a very simple graphics card, but the GUI is fast and responsive. The fstab settings are very similar to the setup I have on the HP t5725.