Ben Scheirman is organizing a conference for the Alt.Net community in Houston and I have heard great things about it in the past so I am planning to attend this year.
The conference is organized in the Open Spaces format. For those who have not attended a conference like this before, the idea is simple. None of the sessions (or very few) are officially scheduled in advance. Generally the first day, in this case Friday evening, the group gets together and plans the schedule based on ideas generated from the group and those who volunteer to speak/lead a session. The sessions are generally very good and highly interactive.
The cost is $20 but that includes pre-conference sessions on Friday April 30, a full day of sessions on Saturday, and a few sessions on Sunday with breakfast and coffee included. Check out the conference website to register and hopefully I will see you there.