Site describes in good detail the basics of CCD cameras. These are digital cameras that have some advantages over the traditional. Written month by month from Abrams Planetarium, this highlights different things that you can watch for in the sky. If your having trouble with what to look for in the sky, this can give you a good start. Publisher of the Astronomical Journal and the Astrophysical Journal which are the premier research journals in astronomy.
Site offers lots of varied opportunities.
This association collects data on variable stars collected by amateur observers around the world and catalogs them. Professionals can access their data for analysis. You can spend hours here finding out about your favorite astro topic. Site is the homepage for the Hubble Space Telescope and describes not only the telescope itself, but the latest research findings. Also, look under the educator resources.