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How many distributions provide anything beyond security/major bugfixes for old releases, such as driver/kernel feature backports and new software versions when merited?
RHEL/CentOS and SLE definitely do, and Ubuntu LTS seems to as well. For example, RHEL 5 uses a (heavily patched) 2.6.18 kernel, yet has new & improved drivers, ext4, KVM, etc. RHEL 4 has a package for Firefox 3, even though it won't build using the included library versions in RHEL 4.