I'd really like to see support for Parrot's PIR (Parrot Intermediate Representation) language. So much so that I wrote a prelimary ParrotLexer myself and will attach the diff.
It works good enough for some tutorial pages on my own site (best samples at [http://coolnamehere.com/geekery/parrot/learn/07-writing-subroutines.html]). I'm not going to pretend this is the bestest lexer ever, but it should give you guys a start.
Reported by brianwisti