Try to view this page with IE7 then try to use a browser (for example FireFox, Opera or Safari last versions)

• IE7 thinks that addEventListener isn't better than attachEvent (without event parameter, type, target and other things)
• ... then IE7 thinks that DOMContentLoaded isn't useful too for WEB 2.0
• IE7 thinks that isn't the time to implement the "old apple" CANVAS element (but isn't Apple a division of MicroSoft ?).
• 
• IE7 thinks that WEB 2.0 and Ajax don't need headers on readyState == 3
• IE7 has decieded that float left with a LI removes automatically list style
• do you want to add some other IE7 un-feature ?