This is almost exactly what I was looking for... except that keyboard input only works for the numeric keypad, not the numbers above the letters. This is a bummer for us PowerBook users.

Finally... I've been looking for a calculator that's easy to use and doesn't take forever to launch. All I could ask for is a paper tape (like in Calculator.app).

Nice little app. Or whatever this is (doesn't show up in the Dock (thankfully), has no application menu, etc.). "Menubar app"? Anyway, pretty cool. Doesn't seem to use much memory or processor, which is nice.

Does add strange "Warning" message in console.log whenever you use it. Seems innocuous enough, but strange...

Can't enter numbers from the keyboard, due to nature of app, I guess.

Tried to email author, but his account did not seem to be working this evening.