Mom 2.0 Summit
I went to Mom 2.0 in 2009 and it was an excellent conference. The organization was excellent and the sessions were extremely valuable -- I got information there that was not available elsewhere. The people who attended were the cream of the crop in terms of the business end of the mommyblogosphere -- there was a much higher concentration at Mom 2.0 of people who know how to make money from blogging. The year I went, all of the Kirtsy people were there, as was Dooce, The Bloggess, Mighty Girl, and Finslippy.
In 2010, the conference underwent some changes to its agenda and its business utility is no longer clear to me. For the reasons listed here, I no longer recommend Mom 2.0 as a business conference, nor will I be attending it myself.