Microsoft APIs
I've had a pretty good history of predicting whether a particular technology was going to survive the test of time or not. Building an app on an API that later becomes deprecated (or more likely, is no longer being developed) is no fun.
So I started building a list of Microsoft's new APIs so I could write down my predictions for the future. I got kind of caught up in it and went back and did a lot of the prior major APIs as well.
The result is this list of Microsoft technologies upon which you can build software. I haven't written out descriptions or predictions yet, but just coming up with the list, and then determining the year the technology was introduced, was a bit of a project.
Can you think of any I missed?