What are you interested in these days?
As we commence with planning this user group it will be important to get a feel for what people want to hear about; we'd be a failed group if we focused on topics that were too narrow or quirky for general interest. Left to my own devices I'm into some pretty esoteric things: Perl and other dynamic languages, compilers, code generation, and other things that usually don't make it past the enthusiast to regular life as a "business" developer.
From a more mainstream angle, here are some topics that I'd be interested in hearing about at our user group:
1. Dependency Injection and IoC
2. ASP.NET MVC and other .NET MVC platforms
3. Dynamic Languages in .NET (IronPython, IronRuby)
4. Visual Studio 2010
5. Blend
6. Silverlight/WPF Techniques
7. SCM (I dislike TFS and would prefer to hear about other products but anything on this topic would be interesting to me)
8. Functional Programming Techniques
9. Data modelling, Object Relational Mapping, and Entity Framework
10. Communication Frameworks (WCF etc... ) and methods (RPC / REST / etc... )
Some other places one could go to dig into what topics (and speakers!) we could pursue are conference schedules. For example, the TechEd Developer Track. There are a lot of other conferences to look for topics: CodeStock, CodeMash, and so on.
So what do you want to learn about? Post your answer in the forums: http://sfdnug.com/forums/p/7/8.aspx#8