I spend a lot of the day answering questions in GetSatisfaction and logging bugs in Pivotal Tracker. I also spend a lot of time on a Macbook Air these days when I'm shuttling my son around and working in coffeeshops, and I've been obsessing over keeping the machine light and clean inside and out.
Inspired by this clever idea about using the Basecamp Mobile site as a Fluid menubar app, I decided to do the same with Pivotal Tracker. There isn't a mobile view, but if you keep your columns collapsed, you can use it with relative ease, and you won't have to keep it open in a browser tab.
The result should look something like this:
Here's the instructions for doing this yourself if you have a Pivotal account.
Pivotal icon should now appear in your menubar and you can click it to open Pivotal in a drop down window. Drag the grippie in the corner to change the window size. Use two-finger scrolling to move in the window, because window scrollbars will be supressed.
Hope you find it useful? I think it's an efficient way to keep it available all the time, while still keeping my browser tab count down.