Greg has released Linux Kernel 3.5.4, the latest stable release for Linux Kernel 3.5 branch. As always, people are recommended to upgrade to this version as this fixed a lot of problems spotted during the development of Linux Kernel 3.6 and it's backported to Linux Kernel 3.5.x.
There are tons of fixes that has been merged on this release. Architectures, drivers, file systems, networking, sounds, and memory management. Every one of them gets a piece of updates that should make it even better than before.