The Web Client Bundle Binaries on CodePlex are now strong named. This includes:

If you want to know whether you have the latest version, you can check your version on the zip file vs the version listed for each bundle. The version numbers are listed in yyyy.mm.dd.build# format. For example the Validation Bundle is:

Validation Bundle 2007.11.16.5

This means the 5th build on November 16, 2007.