It's almost Easter! That means it's time for the eggs. Fortunately, you don't have to go get the baskets. Geoff and Gavin have already found the eggs for you.
From Halo CE all the way to Reach, they've found the top ten best easter eggs. This may contain spoilers for those of you who haven't played any of the games. Enjoy!
http://achievementhunter.com/archive/episode.php?id=3103