i was discussing this question with a friend on saturday. we've both heard conflicting information, so i thought i would research it a bit to find the answer. so, to answer jana's question:
check out ochef.com
for alcohol substitutions, check here.
this site also has quite a bit of really useful information. i refer to it often.
whenever you substitute alcohol in a recipe, however, i would be careful. it will absolutely change the flavor of your finished product. so i wouldn't try it out when you're throwing a dinner party or anything. good luck, and happy cooking!