As an added note, there was an "unofficial SP5" for Windows 2000, that will give you some added updates, including having IE6 w/o having to install it from the go. You can either add it to your original install disk, using nLite, or you can just download & click onto the .exe file, and the SP will install.
Download link for the "unofficial SP5".http://majorgeeks.com/Microsoft_Windows_2000_Unofficial_SP_d4817.html
This SP was written by MS, was considered for release, but wanting to push XP at the time, they decided not to. I have it on all 3 of my 2K installs, and they all run better with it installed.
Now, if only a "unofficial SP4" will emerge for XP, that would be great!