Links

• SCIRUS - scientific information search
• Research Index
• Computer Science Bibliography   [maintained by Michael Lay, Uni Trier]
• A Computer Science Bibliography Mediator
• MathSciNet
• MathSciNet  Search Reviews
  
• Mathematics Abstracts [Zentralblatt fuer Mathematik]
• Google
• Google Scholar
• Other search engines

Interesting:

• Noga Alon's home page [Extremal combinatorics+probablilistic methods]
• Peter  Cameron's home page  [Combinatorics]
• Sasha Razborov's home page [Circuit lower bounds+proof complexity]
• Joel Spencer's home page [Probabilistic methods in combinatorics]
• Umesh Vazirani's Home page [Quantum computing]
• The Computational Complexity Blog [by Bill Gasarch & Lance Fortnow, hot news in complexity!]
• THE Blog of Richard Lipton [if you look for INSIGHTS, extremely informative!]
• Noam's Nisan Blog [not my field, but some very fresh ideas!]
• ... links to other interesting blog's are there

• Graph Theory Page [maintained by Daniel Sanders]
• GraphNet
• DMA-NET
• Theory-Net
• World of Mathematics [maintained by Eric Weisstein]
• Mathematics ArXiv (Math preprints)
• CoRR - Computing Research Repository  (CS preprints)
  
• Millennium Prize Problems (P versus NP among them)
• A Collection of Lecture Notes, Survey Papers, etc (Paderborn)
• Combinatorics on words
• Electronic Sources for Mathematics [Univ. of Pennsylvania]
• History of Mathematics archive [Univ. of St Andrews]

Free journals:

• Theory of Computing [New free journal in TCS]
• ECCC- The Electronic Colloquium on Computational Complexity
  [I am proud to be an initiator of the "eccc-idea" and maintaining the site 1994-2000]
• Electronic Journal of Combinatorics
• World Combinatorics Exchange
• INTEGERS - Electronic Journal of Combinatorial Number Theory
• The Combinatorics Net
• Hilbert's Tenth Problem page

People:

• Combinatorial people, at World Combinatorics Exchange
• Complexity people, at ECCC
• Computer Scientists, TCS Virtual Rolodex at SIGACT
• Home Page search [by Gerd Hoff]

• Universitas Vilnensis (founded 1579) [here I learned mathematics]
• Institute of Mathematics in Vilnius, Lithuania [here I am (now on leave)]
• University of Dortmund [here I was 1992-93 and 2000]
• University of Trier, TCS Department [here I was 1993-99]

• German <-> English Dictionary (TU Chemnitz) [the best I've seen so far!]

• Lithuania WWW (information about Lithuania)
• Lithuania-On-Line (even more information)

• Libraries at uni Frankfurt: Math. and CS
• UnivIS   Information System of Uni Frankfurt