Hi Linda,
This is just my type of question, I love spending my dining plan snack credits and never use them for chips or soda. As a general rule any single serving item under $4 counts as a snack credit, also look for the purple box with DDP and a picture of a cup on it next to menu items.
Some of my families favourite ways to use our credits are -
Magic Kingdom - DoleWhip at Aloha Isle, a delicious pineapple soft serve float. Funnel Cakes from Sleepy Hollow. Ice-cream sundaes from Mrs Potts Cupboard. Ice-cream sandwiches, french toast, cinnamon buns etc from the Main Street Bakery and any of the delicious candy including fudge from the Main Street Candy Store.
Epcot - Lots of goodies from the countries around the World showcase including school bread from Norway, egg rolls from China, crepes from France and Kaki Gori from Japan.
Downtown Disney - the make your own treats from Goofy's Candy Company
You can see a great unofficial list of all snacks on
www.disboards.com go to the restaurants board, click on dining plan and you'll see a thread right at the top called 2009 confirmed snacks.
Happy snacking,
Jo