First, I was specifically looking to see if I could use the same vars available in builder (i.e. $BaseName, $FileName, etc...) in a snippet. It appears not.
In my quest, I went to: http://www.sublimetext.com/docs/snippets, which is the URL in a auto-generated snippet. This page is not yet populated. Would be nice to have a little consolidated docs on snippets. I can take a stab at content ideas if you'd like of even help contribute.