Is there a way I could get syntax highlight to work for haml and sass in Smultron? I know there's a bundle to do this in Textmate, but I would like to have it in Smultron.
Yes definitely. Go to your Smultron file
Smultron.app > right-click > Show package content > Content > Resources > Syntax
Then choose anyfile already existing (Standard.plist is empty so good to use, creating a new one will not work), double-click and change the syntax inside. Pretty straight forward (if you have the Property List Editor from the Developer Tools for Mac so I guess I don't need to give some explanations here. Else, some XML knowledge is required but nothing crazy...