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Child got XBox Live for Christmas.  He has it set up in Bonus Room/Play Room with wireless adaptor.  The signal strength for wireless is not great in Bonus Room/Play Room if you recall  (why I had IMAC in PlayRoom hard wired to my main hub).  I thought you had told me how to increase strength of signal using the IMAC in Bonus Room as transmitter - but can not remember.  Any suggestions would be welcomed.

Yes.  You can use your mac to create an adhoc wireless network.  Go to sharing in your system preferences and select Internet sharing. Unlike the screenshot below, yours will read "share your connection from ethernet to computers using airport".

Then the xBox will then see a new network in the room titled your imac's name network. You can choose to encrypt this network but I wouldn't bother. The signal strength is not great and geographically I don't think you have much to worry about.

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