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ign does this list every year. does the list change much or is it just updated to include new games?
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Every 2 years. The lists change a decent amount. They explain in the intro that it's 2 more years of new games, plus more perspective on older games, plus some different people ranking them, plus tastes just change.
Past lists are here:
http://top100.ign.com/2003/
http://top100.ign.com/2005/
The 2004 and 2006 URLs have Readers' Choice lists, which are horrendous.
The comments at the bottom of the current list put me on serious tilt. One guy said the top 5 games "in history" are Goldeneye, the Hitman "saga", the Splinter Cell "saga", the Super Mario "saga", and the Tekken "saga".