Backpack by 37signals is a terrific online organization and collaboration tool (we've written about Backpack many times). Those wanting a desktop application that works with Backpack have used the popular Packrat. This week, Lars Steiger has offered a solution with more Macintosh style, called Backboard.
Aside from a Mac-like appearance, Backboard also adds a few features to Backpack, like the ability to attach dates and priorities, support for multiple accounts and a nice overview of tasks.
Backboard is currently in private beta, but if you ask nicely, perhaps Lars will put you in the queue.
[Via 37signals' product blog]