Forked from https://github.com/seaofclouds/sass-textmate-bundle. I looked around for decent Sass bundles with better syntax highlighting, but I ended up modifying this godfather bundle.
Put the sass-textmate-bundle.tmBundle file in <username>/Library/Application Support/TextMate/Bundles.
Also check out my Textmate theme which goes well with this bundle: Dyluni Textmate theme.