imho, an awesome site which has links to a LOT of info.
http://ftp.cac.psu.edu/pub/ger/documents/Where95&NT.htm

sorry for posting the following in caps.. i just copy pasted from the page.

SOME WINDOWS 9X/Me/NT/2000/XP INFORMATION SOURCES, FREEWARE, UTILITIES,
ADDITIONAL HELP FILES, KEY WEB PAGES, NETWORKING CLIENTS, DIAGNOSTIC TOOLS,
MAINTENANCE RECOMMENDATIONS, SOFTWARE/FIRMWARE UPDATE SOURCES
AND MAINTENANCE /DEBUGGING HINTS