DZone offers free pdf downloads of their RefCardz - basically cheat sheets
of useful tips and source code examples at http://refcardz.dzone.com/.
They just released a new RefCard on Eclipse Plug-in Development and James
Sugrue wrote a good post on the Eclipse cards available:
http://eclipse.dzone.com/articles/complete-your-eclipse-refcard. Other
Eclipse RefCardz include a general intro to Eclipse, BIRT, EMF, Equinox &
OSGi and RCP.
Thought this might be helpful for some of the newcomers!