We had a look at available Revit Structure API resources almost a year ago, and also published the ADN Revit Structure labs and an analysis link sample.
Furthermore, we discussed the enhancements made in the Revit Structure 2011 API, but the labs and link samples published are still based on Revit 2010.
Let's update that to Revit Structure 2011 right here and now: here is rst_src_2011-03-01.zip. It includes the ADN DevTech labs and link sample code previously discussed, as well as a new version of the RST labs for training purposes.
This is the most comprehensive and up-to-date overview of existing Revit Structure Analysis Link applications available, and is certainly of interest to all RST users, regardless of whether you wish to use existing analysis link applications or roll your own.