Elimination of legacy functionality
I just had a first glance at this OpenGL 3 Overview (PDF) from Siggraph. Check out this highest level overview:

What I like about this slide is that the largest section is about what they’re about to remove (and, from what I can tell, that list isn’t even comprehensive). It’s nice to see that GL isn’t just going to become ever more complicated and crufty until 99% of the developers don’t grok it any longer.
Note to self: bayimg fucking sucks. Converting a PNG to JPEG? Tsk tsk …