I finally got around to downloading and trying out NVelocity.  I was a big user of the Java version, Velocity, for building code generators back in Java land.  Since a .NET project I am working on could use some code generation, I checked it out.  It's great!  I was able to use my Java Velocity templates with almost zero code changes!  (of course, there is no equivalent of EJB's in .NET so I do have some work to do!)