There are an awful lot of newish languages these days. There is also a massive backlog of old languages. As such, I present you with a bevy of links to help you explore them all. Maybe they'll help you race to the finish on that latest project.
DSLs and metaprogramming
Secret Perl Operators
A Haml-inspired mini language for JQuery
Clojure Experiences
A Scala tutorial (PDF)
Write yourself a Scheme in 48 hours
Lots of Rubies. Now what?