If you could show events in the resource tree... wow. I never even considered how powerful that'd be. I'd recommend putting it in a different view which can be toggled, though, as I believe common users would be annoyed by the expandability of objects. I hate in Eclipse that if I try to recursively expand, I get a whole bunch of shit I don't care about (because it's all text files). But that'd be a super cool feature, especially for search.
Yoyo's execution is poor; their results page looks bloated (it's wide and tall; why?) and ugly (it doesn't even expand the whole way; looks like poor CSS). And unless you can float it, or it's always on top, it looks easy to lose. If it's always on top, then it's just annoying because it's always in the way. Copying results to the clipboard could be useful, but the results are overly verbose, too. I'd go resource:line:position: full text of line with terms highlighted
shader0:vertex:2:11: something whatever passthrough whatever
shader0:fragment:2:11: something whatever passthrough whatever
object0:Create:1:0: this line literally just says "ass", you ass
And you may as well keep them in a separate window, unless you can get the total space down (possibly by putting the options all in a single column and the results to the right, or in a row—search box spanning above—with results to the bottom).
Now that I've said that, let me again state that I LOVE the idea of the Eclipse feature. If I may...
Tell me that doesn't look nice.
Now, let me pitch you this: do what I did for JoshEdit: Have a QuickFind dialog which searches in anything, with a wrench to configure advanced settings. Have a small button that does the full-text search, and a small wrench icon that configures it. You can even have that configuration dialog offer a plain-text results list, but I think that's overkill.
Good luck on the implementation; this feature sounds killer.