I posed the question to a Muslim once (not in a mean fashion -- explaining that it was a question often asked Christians and I was curious what his response would be.) He said, "God is all-powerful. He can do anything He chooses to do. Hence, He would be able to create a rock so big that He could not lift it. God is all-powerful, and can do anything He chooses to. Instantaneously He would be able to lift that rock." I'm not sure how helpful that response is, but I found it interesting.

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Timotheus, servant of the Lord
[(Timothy Merkel - Ellicott City, MD - Trinity Reformed Presbyterian Church)]
Ye who are the warriors of God
And of the law of God
Hope in God, believe in God,
And in God you shall ever triumph