In case anybody's interested, I've released a new development version of Ensmer. It doesn't include any screenshots, since it looks pretty much the same as before, but there's quite a few internal changes.
Here's the announcement: https://ensmer.dev.java.net/servlets/NewsItemView?newsItemID=2151
Another note, this release uses the build.groovy format I described earlier, and also uses groovy unit tests. The way that I did this may be kind of interesting to Java developers, as it is a lot cleaner than any other groovy build/test mechanism I have been able to find on the web. It is also cleaner than an ant build mechanism.
I'm not absolutely certain where I want to take Ensmer right now. I think I'll probably start making some modifications to EnsmerMail next, since the stable release won't work at all with the development release of the core. I may focus on EnsmerMail for a while to make it genuinely useable...