Useful links for programmers

Here I will collect useful, in my opinion, and interesting links for programmers: links to educational resources, competition sites, online contests, literature and advices on training, blogs of other programmers, archives and solves of problems.
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• ACM International Collegiate Programming Contest (ICPC)
• Algorithm problems for dummies: Petr Mitrichev's blog
• Association for Computing Machinery
• Code Forces - Online contests
• Delos - contests and trains
• Google Code Jam
• International Olympiad in Informatics
• MAXimal - Algorithms, books, forum
• NEERC online — online trains
• Programming Challenges
• Project Euler.net The site with math problems for which you need a computer.
• Recommended Informatics (CS) Literature
• Saratov State University :: Online Contester
• SnarkNews - News about Russian and international programming compititions.
• Sphere Online Judge (SPOJ) Polish site with archive of polytypic tasks.
• The C++ Resources Network
• Timus Online Judge. Ural site with more than 400 problems.
• Top Coder Competitions
• UVA Online Judge
• Zhejiang University Online Judge
• Internet Olympiads in Informatics
• Internet-school of programming
• Olympiads in Informatics, StPetersburg, Russian Federation