
The Enttec DMX USB Pro is a fairly low-cost (123 Euros) USB to DMX controller. I've had one for a couple of years and it's proven to be reliable.
In order to get it to talk to Max/MSP you will need the dmxusbpro external from nullmedium, it only costs 10 Euros and is available for Mac, PC and Linux as well as Max/MSP alternative PD.
The external comes with a help patch and instructions for installing the USB driver - if you need to.
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Sean Clark will be contributing live video to the Bathysphere stage at Summer Sundae in Leicester this year. Watch out for the fringe festival too...
Sean Clark will be running an enhanced version of his 'Video/Laser Installation' at the Shambala Festival from the 21st to 24th August 2008.