Along the lines of how Apple is associating certain keywords to specific panes in the System Preferences (WiFi – Network), are they doing the same for applications? Type “screenshot” and Snapz Pro and Grab are displayed, type “browser” and all your web browsers are displayed; that sort of thing.

Based on the screenshot at the top of the Spotlight page, I’m guessing this is in place and that the Tiger development tools include a way to assign keywords to your software.