http://www.frets.com/FRETSPages/Musician/Guitar/Setup/SteelStrings/Stringing/ststringing2.html
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To elaborate on what Elmo said, proper tchnique on stringing guitars goes a long way towards keeping them in tune. Check out this site for one way to string.
http://www.frets.com/FRETSPages/Musician/Guitar/Setup/SteelStrings/Stringing/ststringing2.html
http://www.frets.com/FRETSPages/Musician/Guitar/Setup/SteelStrings/Stringing/ststringing2.html