Online Bibliographies

There are many bibliographic sources available on the WWW, but the following I find indispensable:

• Computer Science Bibliographies -- This is a collection of over 700,000 references to papers and technical reports in Computer Science, beneath a sophisticated search engine. While there is much duplication, this is my first stop whenever I need to look something up. The primary site is http://liinwww.ira.uka.de/bibliography/index.html, although several mirror sites are in operation around the world. All references are provided in bibtex format.
• Joel Seiferas' paper.lst -- References to over 55,000 papers and technical reports (at last count), mostly on algorithms and related areas of theoretical computer science. Each paper is reduced to a one-line format, which I find easy to grep through. It is available by anonymous ftp from ftp://ftp.cs.rochester.edu/pub/u/joel, but a local copy is also available. Strongly recommended.
• Geom.bib -- The complete bibliography on anything related to computational geometry, it references over 8,000 books, papers, and reports and includes detailed abstracts for many of them. Grep-ing through geom.bib is an amazingly efficient way to find out about previous work without leaving your office. It is available via anonymous ftp from ftp://ftp.cs.usask.ca/pub/geometry/geombib.tar.Z and a local copy is included.
• TeX User Group Bibliography Archive -- Over 180,000 bibtex entries in a larger and growing bibliographic database effort.