This very useful article asks two experts, Sarah Robbins (aka Intellagirl), of the Kelley School of Business at Indiana University-Bloomington, and Mark Frydenberg of Bentley University, to pick their favourite web 2.0 tools for instruction. Here’s their choices (read the article to find out why, and how they’ve used them).
http://www.tonybates.ca/2010/05/03/list-of-web-2-0-tools-for-instruction/