Ok, I tried this same steps on my old macbook, and no problems, so this MUST be related to the new unibody version. I cannot share internet. Sure, I click on sharing, and it tells me that from my ethernet, I am sharing through my airport... I can even see on my friends PC, my black macbook, and my iphone that the signal is there, and they connect... but that's it. Try opening a website in Safari and the "not connected to Internet" appears. The iphone shows the WiFi signal... but it is not connected, and reverts back to 3G signal. What gives? Have been using Mac for years, so I know how to do this, and trying the same thing FROM my black macbook to everyone works... but not from my unibody Pro. Anyone else had this problem?