Interesting Hacks and articles related to Win XP

Automatically Login to Windows XP
http://www.jakeludington.com/ask_jake/20050905_automatically_login_windows_xp.html

Make your Own Login Screen
http://www.themexp.org/ (Download and Install new Login Screens and other themes)

Popular XP Skins
http://www.wincustomize.com/index.aspx?u=0

Control user Logins by hacking the Registry
http://www.windowsdevcenter.com/pub/a/windows/excerpt/WinXPHacks_chap1/index.html

Enjoy the hacks !!!