The Twin Cities R User Group has been around for a little while, but has just launched a new site at meetup.com. Their next meeting will be on February 16, where Erik Iverson will be giving a talk on using R to generate dynamic statistical reports using R's literate programming tool, Sweave. If you're in the Minneapolis-St.Paul area, this would be a great way to meet other local R users and learn about reporting in R as well. You can find them and 50 other local R user group in the Local R User Group Directory.
MeetUp.com: Twin Cities R User Group