The latest and greatest, stable version of Linux has been released; Linux 2.6.26. The following is a full list of changes from the last version to this one, nicely organized and clearly catalogued for your viewing pleasure:

Linux kernel version 2.6.26 Released 2008 (full SCM git log)

Summary: 2.6.26 adds support for read-only bind mounts, x86 PAT (Page Attribute Tables), PCI Express ASPM (Active State Power Management), ports of KVM to IA64, S390 and PPC, other KVM improvements including basic paravirtualization support, preliminar support of the future 802.11s wireless mesh standard, much improved webcam support thanks to a driver for UVC devices, a built-in memory tester, a kernel debugger, BDI statistics and parameters exposure in /sys/class/bdi, a new /proc/PID/mountinfo file for more accurate information about mounts, per-process securebits, device white-list for containers users, support for the OLPC, some new drivers and many small improvements

Contents

1. Important features (AKA: the cool stuff)
   1. Read-only bind mounts
   2. KVM ported to IA64, PPC and S390
   3. Improved webcam support
   4. Wireless mesh networking (802.11s) draft support
   5. x86 PAT support
   6. Per-process securebits
   7. KGDB
   8. Device whitelist on cgroups
   9. Memtest
   10. Export BDI attributes in sysfs
   11. /proc/pid/mountinfo
   12. Generic semaphores

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You can download Linux 2.6.26 here.