It's not easy to find out the best practice about "Out Of Browser", but as one of solutions on the Internet,
Online Catalog or something like that would be nice... I think.
Because the catalog always provides the latest information whenever we start the "Out of browser", differently from PDF or Word files.
Demo site ( Until Dec 31, 2009 )
1. Silverlight Page
2. Installing Out of Browser
3. Starting Out of Browser
4. Starting Out of Browser when Network is not available
Adding "Out of Browser" on Silverlight is very easy, but not easy to add what kind of service on it ... as usual.