Microsoft's open source project hosting web site

http://www.codeplex.com/

Useful search Tool

http://www.quintura.com/

Twitter Applications

http://www.lo-fi-librarian.co.uk/?p=878

Video Material Related to Computer History

http://ithistory.org/resources/videolinks.php

Database of research literature

http://www.info.scopus.com/about/

Generate webpage with all your fav services

http://www.pageflakes.com/
http://www.netvibes.com

firefox based web browser to access many online services

http://www.flock.com/

on-line social annotation service

http://www.diigo.com

text/audio/video conversations in real-time

http://www.oovoo.com/

open course ware finder

http://ocwfinder.com/
http://www.lecturesarchive.com/4466.html