Today and tomorrow are both $job days, so here's some quick recap.
Gaal hacked in emitting support for Data.Yaml.Syck a couple days ago, but kept running into mysterious segfaults. Thanks to Simon Marlow's accurate diagnosis, we figured out the problem today and Pugs values can now be serialized to YAML via the .yaml() method, in addition to the .perl() method that serializes values to Perl 6.
I implemented $Larry's insane-but-damn-useful notion of Int.isa(Int) in the bootstrap code, so now you can use a class object anywhere a regular object of that class may occur -- as long as you don't call into any methods that mentions instance variables. The metaobject is available as Int.meta, as mandated in the Objects spec -- yes, Int.meta.isa(Class).
Stevan implemented a PILN merge sort in ::List, then ported "mad golfer" Andrew's RPN evaluator code into PILN as well. Oh, definitely read Andrew's amusing+informative writeup about his journey on writing the RPN evaluator in Perl 5, Perl 6 and Haskell.
Jifty is featured in RedHanded today. Woot! :-)