... Version control is essential for collaborative development, and we do a lot of collaborative development at Arc90, so we rely heavily on our Subversion repositories. One of the things we've noticed is that it's hard for developers to keep up with their repositories' and working copies' statuses: Is my copy out of date? Has someone committed something to the repository?
So we wrote a Dashboard widget that monitors working copies and repositories to make sure that it's always clear what's what. And we threw in Growl support to make the package extra appealing. It's a great way to keep tabs on your development efforts.