In the last weeks I have been neglecting Plumhead, that is PHP on Parrot.
Instead I have been concentrating on learning about Common Lisp and Scheme.
Currently I'm working my way through a nice Scheme tutorial, Teach Yourself Scheme in Fixnum Days
I also got me a copy of Lisp in small pieces. But I found that it's better to know a little bit of Scheme, before starting to delve into that.