I am researching Web 2.0 tools for both my PhD program and my graduate assistantship. In looking for basic information I found this great series of videos on YouTube by a guy named Lee Lefever who runs a company called CommonCraft. He puts together these simple, easy to understand, "in plain english" videos explaining the basics of a bunch of new technologies. If you feel intimidated by the jargon flying around these days, watch a few of these. They're awesome.