The 2.6.29 is not released yet.

2.6.29-rc1 has been released though.

Interesting features:

 * [http://btrfs.wiki.kernel.org/index.php/Main_Page BRTFS]
 * [http://en.wikipedia.org/wiki/SquashFS SquashFS]
 * [http://www.phoronix.com/scan.php?page=news_item&px=Njk2MA Kernel-Mode-Setting]
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 . CategoryReleases