Paarthurnax Bypass (by Gshinji)
This seems like a pretty interesting alternative to The Paarthurnax Dilemma. According to the description/comments, it's got a few advantages over TPD. It's apparently less script intensive, it's got voice acting (though it comes from existing lines for Delphine), and apparently what you have to do to save Paarthurnax only requires you to speak to Delphine. The lines for the player are apparently more in character as well, though that's obviously a bit subjective.
I don't have Skyrim installed currently (as I'm waiting for the next version of STEP before I do) so I can't really test this or compare it to TPD, but I thought I would bring it up as a possible alternative to TPD.