The conference series use R! is the major international R user conference. This conference series started in 2004 and it was intended as a biannual event; interchanging with the DSC. However, given the great response to these events in the past, the use R! conference is run since 2006 on an annual schedule. More information on past events can be obtained from the Conferences section of the R-Project
Tutorial: Analysis of Integrated and Co-integrated Time Series, download.
Talk: useR! - at an investment bank?