A newcomer to Rakudo and Perl 6 asked me "Where can I get a list of features that currently work in Rakudo?" Rather than try to build (and maintain) the list myself, I've built a wiki page for it at http://www.perlfoundation.org/perl6/index.cgi?rakudo_feature_status.
You'll notice that the page starts with a list of "common things that don't work" -- I'm hoping that people can use this to get a sense for the common pitfalls without having to search RT (which can be a bit slow). But below that we can start listing things that _do_ work.
Feel free to add/modify the page in whatever ways you think will be useful.