Two things for RHEL shops (if you haven't already heard):
Red Hat has extended RHEL support three years, meaning both RHEL5 and RHEL6 have a full
ten year life / support cycle.
https://access.redhat.com/support/po...pdates/errata/
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RHEL4 is going out of support in a month. (See same URL above.) Get your migration plans started ASAP, laggards.
[ caveat: I don't work for RH. I am just some guy. Hopefully I'm not reposting something you all are well aware of. ]