Humility is equivalent to submission to Allah. We should abandon all selfishness and pride in our human power, and stand humbled, meek, and submissive as servants of Allah above all else.
Among the Jahliyya Arabs (before Islam), this was unheard of. They followed the rules of no one except themselves, and preserved their personal honor above all else. They would humble themselves to no one, neither a man nor a God. They were proud of their absolute independence, their human power; they had limitless self-confidence and refused to bow down to any authority. A man was lord of himself. Indeed, these qualities are what made someone a "real man." Humility and submissiveness were considered weak - not a quality of a noble man. The Jahliyya Arabs had a fierce, passionate nature and would scorn anything which might make them humbled or humiliated in any way, or feel like their personal dignity and status were being degraded.

Islam came and demanded of them, before anything else, to submit themselves wholly to the one and only Creator, and abandon all pride, arrogance, and feelings of self-sufficiency. Many among the pagan Arabs felt that this was an outrageous demand - to stand as equals with each other, in submission to Allah alone. For many, these feelings did not pass - indeed we still see them today in much of the world's people, and unfortunately, sometimes in ourselves. Human presumptuousness, insolence, arrogance, elevated self-worth, are around us everywhere. We have to fight it in our own hearts.

More about this subject: http://islam.about.com/od/prayer/a/humility.htm

And my favorite subject: Prayer Rugs

http://islam.about.com/od/prayer/f/prayer_rugs.htm