Relax folks, this is not something like SP6 for NT.....
It is optional. If you want to get all of the approved (however this is done) fixes for Windows 2000, you have the option of applying service pack 2.
The recommendation is actually to review the documentation before applying the service pack to see if your environment will actually require the effort.
This seems somewhat anticlimactic to me -- considering the way that the industry has been awaiting this service pack, Microsoft just kind of slipped it out with little or no press. It does, however, relieve some of the stress that accompanies "required service packs" that put the pressure on you to get the installation completed.
One piece that is installed by default that you should definitely be aware of is the 128-bit encryption for increase of security. Once installed, you will not be able to revert back to 56-bit security, even if you want to.
The service pack is available in two forms: the express setup which, as it implies, takes up less time and space on your machine as well as your connection; and a typical install which downloads all the files to your local machine and, as a result, requires a high speed connection. I would think that the express install should meet most needs.
If you want to get the download as well as the Microsoft side of the story, go to the following link:
Please give me some feedback about the install and its effects (negative or positive).