Refresh Dallas usually has good turnout; topics are a mixed bag for a non-designer, but entrepreneurial people, in general:
http://www.refreshdallas.org/
In general, I look at new forms of identification, communication, and connection. The network is the overwhelming source of value, and any way to translate between meatspace and online is worth thinking about.
Fundamentally, what will excite you to work on depends on you. A great idea to me may not be to you. What do you care about? Why? What problems are there around those things?