Well boo!  I really like Matt and what he's contributed to both the media center product and the media center community through his blog.  Matt is a Waterloo grad who went to work at Microsoft right out of university and now it appears that he's looking for something with more room to grow.
For those who don't know, Matt's most visible work is that done on the DVD player in Media Center including support for DVD changers and upcoming support for HD-DVD.
Good luck Matt, and thanks for everything you did!