Regedit
Some fun settings
Default User settings on server
Create a "Default User" directory on the NETLOGON share
Choice of language
Directories that should not be saved in profile
This page describes how to exclude some directories from saving, and how to keep others on the server permanently: http://isg.ee.ethz.ch/tools/realmen/det/skel.en.html
Firefox fixes
Netscape is default browser: http://help.netscape.com/kb/consumer/19980502-2.html
Hide H: (or other) drive
http://www.winguides.com/registry/display.php/148 HKEYCURRENTUSER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoDrives
Icons on the desktop
How to hide/show "standard" icons on de desktop: HKEYLOCALMACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace http://www.winguides.com/registry/display.php/7/
Misc security tweaks
Disable applications that user may run, hide last-logged-on name, XP desktop icons: http://home.tvd.be/ws36178/security/administrator/wintricks.html
General doc
Regedit command line flags: http://www.winguides.com/article.php?id=1&page=4&guide=registry