When I started playing with LINQ, I needed to get some clarity on this in my mind, so in the spirit of Linnaeus, Mendeleev and Gell-Mann, I put together a graphic that showed the generations of the various bits, and after talking with friends thought it was worth sharing:

Update:  Daniel Moth has a better graphic for the same data on his blog first.  Shame, not an image map.

Mohammad Adil Akif also has a version in his blog.

...This is the blog version - the original form was a Post-It note.
...And in the spirit of Web 0.9 (which came before Web 2.0 the graphic is an image map

I know there is much more coming, like the Dynamic Language Runtime, Domain-Specific Language tools, Silverlight, and so on.   I've also chosen not to call out the versions of Team System, both in the interest of clarity.