Conference Proceedings

ESANN Electronic Proceedings
Free access to proceedings of past ESANN conferences in PDF format. Some abstracts are missing and some papers are scanned.
http://www.dice.ucl.ac.be/esann/proceedings/electronicproceedings.htm

NIPS Online Abstracts and Papers
Free access to papers for all NIPS conferences. Papers are in DjVu format (free software and plug-ins available).
http://nips.djvuzone.org/