Open extern
This is an eclipse plugin, which you can use to open a shell (either a command prompt - CMD or a linux shell), or a folder (windows explorer, nautilus, konqueror) from eclipse's resource navigator or package explorer. Works on Linux, Windows and MAC OS (not working yet on MAC see: http://code.google.com/p/openextern/issues/detail?id=4).
Require Java 1.5+, Eclipse 3.3. Current version 1.0.3.
Update site for eclipse: http://openextern.googlecode.com/svn/trunk/openextern_update/