Links

General

• Google Scholar
• Science Direct
• CiteSeer
• arXiv

Blogs

• Tim Gowers Discussions
• in theory (contains more links)
• Scott Aaronson's Blog (contains more links)
• Complexity Blog
• Essays by Oded Goldreich

Puzzles, Problems, Other stuff

• Geometry Junkyard
• Geometry Literature Database
• Encyclopedia of Integer Sequences
• Ponder this..
• Goettingen State and Univ Library
• A Nice Collection of Lecture Notes, Theses
• Combinatorics.org
• Just for fun :) (geezed from here).
• Links to stuff in Combinatorial Game Theory

Programming

• acm.uva.es
• timus.ru
• A chinese ACM site
• STL Documentation
• USACO