Steve Lasker has posted Additional Q&A on the Visual Studio Orcas Sync Designer (March 21, 2007) and First look at the Visual Studio Orcas Sync Designer (March 22, 2007) on his blog. Steve added part 2 of the screencast: Going N Tier w/WCF, Synchronizing data using Sync Services for ADO.NET and SQL Server Compact Edition this morning.
There's related content in my SSCE Sync Designer Q&A and Screencast post (March 22, 2007) on the OakLeaf blog.
Orcas sync designer makes it quite easy and enjoyable experience to build offline applications. I totally love it and I am sure people will love it too.