hedwards: Perhaps, but considering how many times I've had to reinstall Windows over the years, I'd rather just download once and then apply just the patches that are needed.
JMich: Why are you not slipstreaming the patches into the installation disk then? You've already downloaded them, take a bit longer and patch the disk, then use that to install. Quite a bit faster, since it doesn't need the reboots requests you get if you install the patches on an installed system.
Because of reasons.
Well, part of it is that you can't update already installed copies using slipstreaming, you can only do that at install time. So, it does solve the part about being caught with your junk out in the air during that first bit. But, I've got more than one computer, so I can take the WSUS disk from computer to computer and save a bit of bandwidth. It happens that it's also useful when I want to reinstall.
It also means that I have a copy of all those patches for cases like XP where MS is going to eventually turn off the update server completely. And can share those copies between computers if need be.
That's not to say that slipstreaming isn't worthwhile. But, out of habit, I only bother to slipstream a copy when there's a new service pack out. I'm just too lazy in most cases to create new installation media the rest of the time. And WSUS has more flexibility.