Places to find projects:
http://sourceforge.net
http://rubyforge.org
http://www.codeplex.com
http://www.tigris.org
http://berlios.de
(for you designers)
http://www.oswd.org
http://www.openwebdesign.org
Some examples of good open source projects
http://www.castleproject.org
http://www.rubyonrails.org
http://ironruby.net
http://mbunit.com
Tools of the Trade
Subversion - http://subversion.tigris.orgTortoiseSVN - http://tortoisesvn.tigris.org/Testdriven.NET - http://testdriven.netNunit - http://nunit.comNant - http://nant.sourceforge.netMSBuild – included with .NET Framework 2.0Firefox – great for webdevelopment