There are so many…
Pop-open LaunchBar and hit “d” to go to the Desktop — then type to filter items on the Desktop.
Pop-open LaunchBar and select an app — then Option-Right-Arrow into the app to discover hidden files in it — including the version number.
Continue inside the app to the Info.plist file and Right-Arrow into it — to see structured XML nodes.
Pop-open LaunchBar — select an app like BBEdit or TextWrangler and hit the Spacebar — to bring up a recent documents list.
Create a “Working Items” folder in the Finder — index it with LaunchBar — give it an abbreviation like “wk”. Then you can type “wk” in LB then Spacebar to access all your working items.
I have working, pending, and action folders.
I also have my code library folder indexed, so I can find things quickly.
I use LaunchBar’s calculator regularly and only fire up Soulver or Excel when I have something really complex to compute.
There’s sooo much more…