SiteMesh build and source code are available at GitHub. The jar files are also located on the Maven Repository.
SiteMesh 3 is in the works. Please try it out and provide feedback.
I am missing,
Jar for 2.2
Official release date for 2.4.2 and 2.0.1
Full, Blank apps and Example app (whatever is not linked).
If not handy, the next step will be to build from the Maven and Github repositories, but first, Joe, do you even want to keep the older versions?