One security update has been released on -Current for kdelibs. This package is rebuilt and thus fix CVE-2011-1168. Other packages gets rebuilt and upgraded as well to fix reported problems on LQ. Some of them are btrfs-progrs, mkinitrd, pmake, glib2, and procps.
We are waiting for the next RC (or directly a final release) of Slackware which should brings us to Linux Kernel 18.104.22.168, even though some people asked Pat to consider using Linux Kernel 2.6.38 on Slackware 13.37 since 22.214.171.124 will be the last 2.6.37.x series which will be supported by Greg unless there's a new maintainer stepping up for maintaining this version.
Linux Kernel 2.6.38 does bring quite numerous changes, including a better performance on Intel, AMD, and NVidia graphic cards. For more information about new features and or changes in 2.6.38, please refer to Kernel Newbies entry.