tänzer also listens to loads more industrial music than Perl's Dancer, but will often be caught listening to Björk when she's hiding.
One thing I'm particularly keen on, with tänzer, is making it possible to easily swap in any ol' static file filtering mechanism by way of ::tanzer::file::handler callbacks. Without even necessarily having to write one's own request handler, one can simply filter the files before serving without any heavy lifting. A few examples would be transparent static asset minification, and template processing. Speaking of which, one of my next priorities is finishing up code and docs for teaspoon (whose file extension is .tsp; HA! HA!) so we can have a demonstrably straightforward set of swappable, pluggable web components in our little Tcl world.