XML::Filter::XSLT is now on CPAN. This is part of a larger plan to build a new Axkit-like framework around POE for doing B2B systems. It's coming along quite well now, so I expect to have something you can actually play with (though no GUI yet) in a couple of weeks.
I've enjoyed playing with POE. I think I know enough about POE now to consider myself fully competent in it. I've played with just about all aspects: alarms, wheels, sessions, aliases, signals, etc. Soon I think I'll write POE::Component::IRC::Bot, which will make some of the more annoying bot-like things you have to do with PoCo::IRC a lot simpler.
The only thing I haven't really investigated is POE::NFA, but it looks fairly simple based on my perusing of the man pages.
Oh, and even the POE source code is starting to make some vague sense to me! (it uses source filters and macros everywhere, making it very confusing).