Hi gang, I just uploaded Mouse 0.01 to CPAN. It's designed to be an API-compatible, fast replacement for Moose. It supports practically all of "has". It has a very light MOP (mostly what I needed to write "has" :)). Perhaps it's best marketed as Class::Accessor::Moose at the moment, but I do intend to provide more Moose goodness in the near future -- method modifiers and roles.
What I like best is that if I s/Mouse/Moose/ on the test suite, only 3 out of the 2045 tests fail. Granted, 1700 of those tests are just battering the type constraints. Also, the tests run in 8 CPU seconds with Moose, 2.5 with Mouse. I haven't yet tested Mouse on the Moose test suite, but I expect it wouldn't go so well. :) Have a look, let me know what you think, or what you'd like to see next! Shawn