Ubuntu Guide posted a tutorial about installing Linux kernel 2.6.39 rc4 in Ubuntu 11.04 Natty
Linux Kernel 2.6.39 rc4 was released on Apr 18, and following is what Linus said in the release document:How to Install Linux kernel 2.6.39 rc4 in Ubuntu 11.04 Natty
So things have sadly not continued to calm down even further. We had more commits in -rc4 than we had in -rc3, and I sincerely hope that upward trend doesn't continue.