Transmission does work on my Intel Mac although it seems to be one feature poor client.
Azureus would not run for me either, manually trying to run the .jar file produces an odd little error I haven't tried to track down yet.
The client that shopkin linked to appears to be the official client, but it seems to be missing quite a lot from a normal distribution. (The non-gui version, the headless client, etc -- and is a (PowerPC) binary rather then a python script like I would have expected.)
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