With the Trustworthy Computing initiative, we'd all thought the days of easter eggs in Microsoft products had died, however three enterprising young men from the Anti-piracy Team at Microsoft managed to get themselves included as part of the security hologram on the front of every copy of the Windows Vista media. If you have a copy of Vista handy, take a close look at the color windows logos, in the outermost circles you will see two large rectangles with two small rectangles either side (about 1mm high). If you zoom into these rectangles you'll either get a public domain picture of an old master, or the picture above of the folks that designed the hologram. Good work fellas! For more information, see the Windows Vista blog, the site of the guy who noticed this picture or the Engadget post about the story.
