It's pretty much the same with Windows 7, just click change adapter settings then wireless network connection (right click) then Properties then sharing and you should have it all done.
If The Bridge doesn't work, the alternative is to activate ICS (Internet Connection Sharing). Just follow the same instructions but instead of clicking Bridge Connections, click properties and click the sharing tab. Next check "Allow other network users to connect through this computer's internet connection" and you are done. Just add Xbox to your list of extenders in MCE and shared devices in Zune or WMP so you can play music & video off your PC as well as connect to the internet.
Unfortunately some people may find that you may have to remove the bridge whenever you want to browse the net with the laptop. Sometimes it can work though. But all you have to do is remove the bridge and then put it back on again when you want to play.