All sorts of free apps and utilities, primarily for Linux but a lot for Windows as well (such as GIMP = like photoshop).
Search online for scientific references.
Increase or decrease your ego by seeing how many people actually cite your publications (need to register)
Linux User Group Of Rochester homesite. These guys & gals are good and can be very helpful.
Informative and fun.
Descriptions and explanations of web and computer jargon.