For many years I've been testing kernels from Linus's git repository and I find that about twice a year the kernel devs do something evil that breaks proprietary video drivers. (I suspect they do it on purpose but I can't prove it ;)
I have no idea how many of you like to test bleeding edge kernels but I thought I'd ask. I have some seriously ugly hacks for building the nvidia (and very recently) the ati proprietary drivers against git kernels, but I won't spend time explaining them here if no one is interested.
