Most of the changes in Windows XP Service Pack 2 are under the hood. If you’re a network administrator, an IT professional, or just an interested computer user who can tolerate some technical details, you can get a wonderful overview of SP2 from this Powerpoint presentation put together by Mark Minasi. It boils down 1,000 pages of technical documentation from Microsoft into a hundred slides covering everything from the new controls on the workstations to the fine-grained control available in corporate networks through Group Policy.