
Few items on this list actually take only ten minutes, but it's a great place to start, and they also explain why you want to try some Web 2.0 resources.
Links:
[1] http://www.progressivecommunicators.net/en/drupalit/count-vote/157/1
[2] http://www.netsquared.org/blog/kanter/nptech-tag-summary-10-web-2-0-things-you-can-do-ten-minutes