Just an update here.
I've posted some info on the N3/Turtle bundle here:
http://trac.openvest.org/wiki/n3SyntaxHighliting
I've also started to work on some SPARQL there.
The short version is: yes it's ready for public consumption (no warranties or indication of suitability ...blah blah blah)
Perhaps the last posting (re a larger semantic web bundle) is how it should be incorporated into the textmate bundles svn. I'll wait to see if there are any other Semantic web bundles in the works.
-- Phil