This jetpack is a slidebar version of the Ubiquity command I've written to post
transactions into Buxfer. It's more mouse-friendly than the Ubiquity version,
so some people may find it better (ymmv). It's nothing fancy, just a straight
connection to Buxfer's API to add a transaction. But it works! :)
If you're not using Firefox, don't use Buxfer or if you don't have Jetpack installed, this page is of no interest for you. :)
Otherwise, go ahead and install, or check the source code.