I've been working on a piece of software to parse BeerXML files and download the appropriate settings to a BrewTroller. I recently finished the first version, and it is available for download here (click through the ad that linking from HBT forums causes).
I've tested this on a Windows 7 and Windows XP and it seems to work for both.
Please keep in mind that this is a beta version. I've tested it as well as I can given the resources I have, but your mileage may vary. That being said, if you have a chance to try it out I would love to hear whether or not it worked, if not what error message you get (there's also a log file called except.log that you could email me...) what operating system you're running and which BrewTroller you have.
I'm currently working on porting to OSX for all you mac users, and will probably throw together an Ubuntu package at some point as well.
The source code is available here if any of ya'll are into that sort of stuff.