Today LitePC, creators of "98lite" which is used to remove unneeded Windows components have also released a product for Windows 2000 and XP, cost is 40$ per licence, with big discounts for Multi-System licenses. The license gives you right to use their software on either Windows 2000 or XP...
A trial version free of charge is also available....
Note that the free version is a single file that does not install anything... I.e. it works in both 2000 and XP, however this is not true for the full version. If you buy it now you will get both 2000 and XP lite but if you wait that offer might be gone and you will need to buy separate licenses for the XP and 2000 versions of "lite"...