[to3m]

Visual Assist does the Komodo thing in its file name and symbol selectors. It's excellent. I've never used any other search mechanism that's quite so good for very quickly narrowing down large lists to a handful of items.

(emacs users may be familiar with iswitchb, which can be operated in a similar manner. Entering space-separated strings in Visual Assist is equivalent to entering those same strings in iswitchb and then pressing C-SPC after each one to perform each search on the result of the previous one. This is marginally more fiddly, but the key part is being able to narrow the list down with one substring, and then add more substrings to further refine things.)

I've added a similar Visual Assist-/Komodo-style UI for finding things to a couple of programs I've worked on, basically copying exactly what Visual Assist does. The response is always positive.