[yellowapple]

Scala, Clojure, and Erlang come to mind. F# is another possibility, since .NET/CLR is becoming increasingly popular in the enterprise (particularly in Windows-heavy datacenters), though I don't know of a whole lot of enterprise F# deployments off the top of my head.

Erlang's a bit of a special case; while you probably won't see many enterprises consciously using it (unless they use Jabber/XMPP via ejabberd, of course), it's rather abundant behind-the-scenes with communication infrastructure, and multiple large telecom providers and OEMs (including - obviously - Ericsson) use it for their equipment and infrastructure.