This experimental search is very well done. Will definitely recognizes a problem a lot of us are having with trivial day-to-day stuff such as looking up documentation for a Django function or class. I know a lot of my time is spent looking up functions.

Because of this, I've been working a light-weight search-engine to sift through the Django source code:

http://www.djangocodesearch.com

Hopefully it'll help you find the code you're looking for, fast.

In regards to vertical search, I feel like the biggest barrier to competing with G/Y/M is the relative difficulty a user has to go through to reach the actual search page before entering in the information. If its more than a few key strokes away, then the user has a natural tendency to resort to the Big 3 engine which are situated conveniently in their search bar.

Adding a Firefox Keyword Search would definitely be a step in the right direction, but unfortunately the other browsers don't have that facility.