Silhouette FX has just released Silhouette v4.1, a free update for Silhouette v4 customers. For a complete list of new features, changes and bug fixes.
New features include a re-written Planar Tracker that is simpler to use and provides robust results on a variety of sequences, Source node additions including Flip/Flop and Extend Duration, and more Actions. In addition, there are a number of other Paint and Roto enhancements.
If you are still using Roto & Paint v2.3 or Silhouette v3.x and want to take advantage of these new features you can upgrade to Silhouette v4.1 here.
FAN AFX2VPB, which allows for import and export Quantel VPB files into After Effects is now AE CS5 compatible.
Also, One of Harry Frank's favorite plug-ins, FAN BikiniDots is also now AE CS5 Compatible.