While we know a lot of developer units for Windows Phone 7 would be sent out in the last few weeks, we didn't know exactly how many.
Turns out it's just above 3,000. That's a lot of non-production prototypes if you think about it. Then again, it's a drop in the bucket in terms of developers who still want a device and who are needed to beat back the Android craze.
The number comes by looking at the official Windows Phone 7 Facebook app that comes with the device. The logic being that 3,000+ users have installed this app on their phones, hence the correlation.
Then there's probably the ten or twelve people like myself who don't have Facebook, natch. So more like 3,088.