Can not connect to Airport after Lion

Hi folks,
I just updated my MacBook to Lion and now it will not let me connect to my airport. None of the setting changed on the airport. It just stoped connecting. I can however log on to it with my iPad. Any ideas?
I

Do you get an IP Address when you check under System Preferences->Network->WiFI ?
What wireless router are you using ? (make /model)
Did you try deleting the network from Preferred Network's and then re-joining the network ?
Did you try a SMC reset ? Some folks have suggested it helping.
When you scan for networks by clicking on the WiFI Menu Extra, does it see your wireless network ? What happens if you attempt to join this network ?
Also check if the password is correct in Keychain Access App. You could try deleting this network in Keychain Access and try to connect again.

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