General Links

• Freshmeat.net - Open source projects and applications. A member of OSDN.
• ThinkGeek - Caffeine, clothing, gadgets - everything you'll ever need.

Math Links

• AMS - American Mathematical Society
• MAA - Mathematical Association of America
• MathWorld - Eric Weisstein's MathWorld.

Computer Science / Information Systems Links

• ACM - Association for Computing Machinery
• DevGuru - A complete reference to many web-based languages.
• Kuro5hin - News and culture.
• Slashdot - News for technophiles.
• SourceForge.net - Open source projects and applications. A member of OSDN.

Physics Links

• Eric Weisstein's World of Physics - World of Physics