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The previous stable kernel, 2.6.21, was released a little over two months ago on April 25'th. An overview of all the changes merged into the latest version of the kernel is maintained in the Kernel Newbies wiki. Included in the list of changes are the SLUB allocator which replaced the slab allocator, a new wireless stack, a new firewire stack, and support for the Blackfin architecture. Source level changes can be tracked via the gitweb interface to Linus' kernel tree.