I had a slight issue with mine the other night were it kicked me off the wireless connection and refused to reconnect, kept giving me "An error has occurred". I just turned it off and the next morning it was fine. Called Apple last night but since I can't replicate the problem there is nothing that they could do, it was blamed on interference.
At the time it stopped working my roommates MB Pro was connected and as was my other Dell laptop, so I don't believe it was a router issue. The system error log kept giving me a failure in the function WirelessAssociate2() (can't remember the exact error right now).