I followed the instructions from here http://arvinderkang.com/2009/09/01/installing-scala-on-snow-leopard/ but I used version 2.7.6 (rather than .5) I installed scala under /usr/local/scala so I had to include it to my path. Type

vim .bash_profile
export PATH="/usr/local/bin:/usr/local/sbin:/usr/local/scala/scala-2.7.6.final/bin:$PATH"

Now to download and install...

curl -O http://www.scala-lang.org/downloads/distrib/files/scala-2.7.6.final-installer.jar
sudo java -jar scala-2.7.6.final-installer.jar

This will launch an installer. Just follow the instructions and when it asks for the destination folder, remember that it's in /usr/local/scala Simple as pie!

Just finishing up brewing up some fresh ground comments...