I don't know whether somebody else has noticed it, but for those who are not into Linux kernel versions and their distinctions, it's mostly irrelevant.
Tux, the Linux penguinImage via Wikipedia
What is relevant for Nook Color users and developers on their road to Ice Cream Sandwich (when AOSP 4.0 will materialize, that is) is this:
-- SGX Video Acceleration (in principle, it was available in kernels after 2.6.35, while CM7 has stuck on 2.6.32);
-- DSP, a (better) support is offered in kernels after 2.6.38;
-- Better OMAP Frame Buffer drivers (omapfb): for the Beagleboard development platform they talk in favor of using more software-optimized driver based on NEON extensions, than a SGX hardware accelerated renderer (fbdev).
(info from elinux.org on Beagleboard Debian)


Snugsam's Google Nexus has a TI OMAP version of PowerVR SGX GPU and also a similar DSP, so hopefully, its open source repositaries will have nicer drivers for 2D/3D/video hardware rendering on our very obsolete Nook Color.  
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