John Barnett has a nice site with over 100 good WinXP solutions.
"The Windows XP frequently asked questions section contains some of the more popular tips/tweaks. Obviously, this section will be updated pretty regularly so do keep visiting to check what new FAQ's have been added. All FAQ replies are supplied 'as is' I am unable to accept any responsibility resulting from the use of any of the FAQ replies. You use them at your own risk!'
Here's a sample:
How Do I Enable Show Hidden Files and Folders
How Do I Get XP To Empty The Temporary Internet File Folder When My Browser Closes (UPDATED)
How Do I Hide Icons In The Notification Area
How Do I Add/Remove 'Supplied By /your>From Internet Explorer Title Bar
How Do I Replace a lost, broke or damaged Windows XP CD
How Do I Delete An Undeletable File
How Do I Create A Desktop Shortcut To The Windows Disk Defragmenter
How Do I Enable Single Clicking Of Icons To Open An Application
How Do I Disable The Windows XP Splash Screen
How Do I Change The Default Location Of The My Document Folder