Re: Grub2 multiple Fedora's
The extra entries in your grub menu are normal.
yum will keep 3 kernels by default, and they show up in your grub menu. This is so that if a kernel update is bad, you can still boot your system.
Have you installed any kernel modules? Perhaps for wireless network or video? If so, then those must be updated when you install a new kernel, since kernel modules have to be built for the particular kernel version you are running.