Click "Safe Sleep" and read a great article about creating a safe sleep environment.

Here are the highlights of the article:

Place infants to sleep on their backs
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Use a firm, tight-fitting mattress
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Never use extra padding, blankets or pillows under baby
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Remove pillows or thick comforters
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Do not use positioning devices – they are not necessary and can be deadly
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Regularly check cribs for loose, missing or broken parts or slats
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Do not try to fix a broken crib
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Place cribs or playpens away from windows and window covering cords to avoid fall and strangulation hazards
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Place baby monitor cords away from cribs or playpens to avoid strangulation