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The two that I 've found most useful has been http://tweetdeck.com and http://objectivemarketer.com
From the SDVG:
Thank you for attending yesterday's SDVG breakfast program featuring Guy Kawasaki. As promised, here is a link to the list of websites he featured in his talk:
(The link will also be posted on our homepage at www.sdvg.org by the end of the day.)
We hope you enjoyed the program, and we hope to see you at an upcoming SDVG event soon!
San Diego Venture Group
Wed., July 22, 7:00am – 9:00am
"The Future of Successful Investment in Biotech"
Hyatt Regency La Jolla
Thurs., August 20, 4:30pm – 7:30pm
Annual Summer Social: "A Tropical Picnic in Paradise"
Scripps Seaside Forum at SIO
Wed., Sept 16, 11:00am – 4:00pm
Annual VENTURE SUMMIT
Hilton Bayfront San Diego