Selected links & tutorials that helped me immensely:
Blender for the faint-hearted @ Sci-Fi meshes
If you only look at one site, look at the Faint-hearted tutorials - they helped me the most!
2.43 Manual
Blender Hotkeys list
WikiBooks Noob to Pro series
BlenderArtists
Also there are quite a few video tutorials on YouTube that are quite useful. For example the " target="new">array modifier.
I'll take a look at that scifi-meshes one. The one I learnt on was the "noob to pro", what did you think of that series?