MP3 related links

Probably the best music-related software collection on the net, updated every day

Excellent, very similar to the previous one

winamp.com - Home of the most popular player nowadays

Programming related links

Programmer's Tools - A must-visit page for all Windows programmers

PacketStorm - The best collection of security related materials - utilities, documentation, tutorials, exploits, vulnerabilities, specifications, etc.

Search Engines

Northern Light - The best one

Google - Excellent, with huge database and great capabilities

FAST - Huge database

Altavista - The most popular, but still full of bugs

HotBot - Lots of options, but small database

Yahoo - The best and most popular web portal, has also a good Inktomi-based search engine

Excite - Excellent web portal and search engine, in some aspects better than Yahoo

AstaLaVista - A great search engine for security (hacking) related stuff