Seeing as how I just gathered the data for someone, I thought I'd put the latest numbers out there for all to see.
Microsoft Certified Masters
Microsoft Certified Architects in Exchange
In total, there are 150 people at Microsoft with one or more of these certifications, and 67 who work either for a partner or independantly.
The good thing to see in my eyes is the increasing ratio of non-MSFT folks gaining MCM 2007 status. Remember, the program was internal only when it started and so the Microsoft numbers will always be higher for the early years, but it's changing. And I like that.
Where can I find current MCM certifications stats?
The list below includes those who have agreed to share their details, so there are bound to be more, but it will give you a good idea: