I notice there is an sbaz tool that seems to have similar functionality to the ruby gem tool but I don't see any community site like gemcutter.org / rubygems.org. Is there something like this around.
There are 1084 repositories on github with scala in them. I'm surprised I can't find some centralized package management utility. Perhaps I'm just googling the wrong keywords.
The closest equivalent is probably http://scala-tools.org which maintains a Maven (ivy, sbt, etc) repository of most of the best-known packages.
As Kris said, http://scala-tools.org is the closest thing so far. We're working on improving the site, and will be enabling "static project sites" shortly. There's also http://implicit.ly/ which aims to be the standard new source for published releases.