Back a few months ago, everyone was scrambling to get Daylight Savings Time patches installed. The patches themselves were buggy but better than nothing. Most companies only had from a few days to a maximum of three months' lead time to get things sorted.
Smart admins aren't in any rush to install the latest and greatest software. It took over a year and a Service Pack before companies even started rolling out XP to desktops. Due to the nature of our software and the testing required before roll-out (as well as the regulations which govern many of our customers), we might release three more patches before any company rolls out the earlier one. Patches rarely have deadlines. Fixes often do.
x-posted to da brog, sans bottled water poll.

