Despite having invested a bit of time and brainpower in Erlang, I have a suspicion that Scala is more likely to be a better bet over the long haul. It's fast, piggybacks on all the software out there for Java, and seems to be reasonable to use.

I do have some questions about its concurrency abilities though (not rhetorical ones, real ones): I know that Erlang deals really well with concurrency, because of its internal scheduler. It's fairly difficult to completely wedge Erlang, in other words. How does Scala work out from that point of view?