Thank you Vince,
I tried clearing my media cache files with no result. Importing my project into a new project is a good idea that I hadn’t thought of. I was going to try and reinstall OSX but could not find my disk, so what I ended up doing was just updating to 10.7.3. Premiere still kept crashing after that, but then I verified and repaired my permissions for a third time, and that seemed to do the trick. It’s been stable for the last hour or so and hasn’t crashed yet. I’ll keep this updated with what happens.