Loving Precipitate so far, so I thought I'd share a trick:
I rarely use Spotlight and I use Quicksilver all the time. So I added
the folder Precipitate uses for caching to my Quicksilver catalog and
now my Google Docs show up in Quicksilver, and they open correctly in
Firefox. Awesome!
For a little more detail see:
http://sopithy.com/2008/07/08/precipitate/