Personally, I wouldn't just happen to guess what SST stands for as I search CPAN for a templating package. Lets say that your module has three primary features:

1. It outputs XHTML
2. It's a templating utility.
3. It's simple.

So tell the world that in the package name:
XHTML::Template::Simple

That way when someone searches CPAN for XHTML and Template, they'll quickly understand what that module is for as they see it in the search results.