MsgFiler 2.0.1 is ready
When a new message arrives (or group of messages), simply press Command-9 to bring up the MsgFiler window. Select the messages you'd like to move, type the name of the destination folder and hit Enter. That's it! You're messages are sorted.
Version 2.0.1 has been totally rewritten in Cocoa. It requires Mac OS 10.4.8 and costs $8US.