> There is a lot more that could be done to make this "crowdsourced testing" more effective. Currently it is quite difficult to test out -rc releases. You have to know how to compile a kernel, and how to install and run it in your distribution. Certainly not rocket science, but not easy for the average distro user, which is who you'd need to go after for large-scale outsourced testing.
Having to compile the kernels is a burden indeed, especially for those with weaker machines.
At least for Debian-based disributions it seems that Canonical provides daily compiled kernels, which is cool to have in mind (I only remembered that when I read your comment):