Are there any Scala libraries/implementations/projects on bitcoin? There are quite a few Java libraries and I am building my Scala code on BitcoinJ, but obviously, native Scala libraries would be quite a bit more elegant. Has anyone tried?
I really don't think it's needed. Bitcoin is a complicated project, it's better to have one canonical JVM-based library than a library in each JVM language.

AFAIK there is currently no Scala library, and I'm betting there won't be for some time (unless perhaps as a wrapper to bitcoinj?)