Bits On Wheels is a Mac-only Bittorrent client. It's freeware (but not open source or public domain) and it looks like this:
It has the usual Bittorrent features, and runs a little faster than my other client, Azureus.
The neat thing that sets it apart is the 3D swarm view, shown above. Bittorrent works by enabling participants to self-organize into a swarm: a group of machines group-hosting a particular file at a given time. ... The 3D swarm view shows yourself in the center. Hosts you are connected to lie around the periphery: although a Bittorrent swarm can be a complex graph, the swarm view is self-centered.
It's okay to reblog your own stuff, right? --MM