I've updated Trippi to expose SPARQL in Mulgara. This was easier to implement than I had originally thought. I had thought that exposing Mulgara's SPARQL support in Trippi would require the use of Mulgara's new Connection API, but that was not the case. I've also updated Trippi with the latest Mulgara release (2.0.5).
Pending review of a patch submitted by Morten Grouleff for an unrelated Trippi bug, I'll tag a new 1.4 release for Trippi. In the meantime, dev-150796 and dev-2075351 (branches for Fedora 3.0 and Fedora 2.2.x, respectively) contain the latest Trippi builds with SPARQL support.