If you are interested in developing web 2.0 or embedded devices applications, Stack Overflow developers' day , or as they call it DevDay, may be a good networking venue for you.
The DevDay is touring across the United States in Oct 2009. They are going to have several day long events in Seattle, San Francisco, Los Angeles, Austin, Boston and Washington DC. In every city they will have about six speakers talking about
For more information check out the coordinator weblog. The event webpage has the list of some of the speakers.
Stackoverflow is a web site where software developers can ask their questions and contribute by answering the posted questions. It has a user-friendly interface as well as features that separate it from other forums I have seen. It had 3.5 million unique visitors per month- only 6 months after being launched. The large number of visitors encouraged the founders to think of ways to bring the developers together in real life. The October tour is their first effort to facilitate face-to-face interactions between the visitors of their web site.