I'm sending this out to the group since we currently have no presenters scheduled for 2012 and we're approaching March pretty fast.
In the past we've had people express an interest in tutorials/overviews on the following topics:
3. plyr & reshape
4. time series packages
5. S3 vs. S4 objects
6. Modeling & classification in R
7. Real life use cases - just getting up in front of the room and talking about how you've used R.
Would anybody be interested in presenting on any of these topics? It could be as advanced or as introductory as you'd like to make it.