This is nice in FF on the Mac but doesn't seem to work in Chrome on the Mac (not that developers <i>need</i> to support a beta browser quite yet).
After building and using some complex web apps, it would be nice if there were search boxes like this that quick-linked to functions in the application. For example, if I am new to a project management application, and need to find something obscure like, "login settings", it would be nice if I could type "login" and see a list of things that matched that function.
Odd, I'm using Chrome 5.0.366.0 on my Macbook. The demo works fine.
I was inspired by this when I created a filter-able program for the CHI Conference this year. Hoping to bring this feature to all future conference programs for CHI.