FC3 Kernel vs...

Greetings wise ones! So far, I've been faithfully using the kernels supplied by the FC3 repositories (2.6.9-1.681_FC3, etc). In a couple of messages I've seen suggestions for getting a kernel from another source (linuxant?) to improve MySQL performance, and on another mailing list (win4lin) get the kernel sources from kernel.org, apply win4lin patches and compile your own kernel. Obviously there are differences, and obviously the fedora folks have added stuff to the kernel. I've read through the kernel.spec file and seen the list of patches to be applied (and backing out patches), but I still have the question, what does the "official" FC3 kernel have that the latest 2.6.9 kernel from kernel.org doesn't have, or vice versa? Is there a list or comparison of the kernels anywhere? I would like to have win4lin working, but what would I lose/gain by using the latest generic kernel from kernel.org? John