Since I don't eat too many sweets; I prefer savory. However, I do love a good chocolate fondue. This is my favorite http://www.chow.com/recipes/30661-chocolate-fondue; I change up the liquor according to what else I am having for dinner. You can do hazelnut, orange, raspberry, amaretto, etc.
Of course, serve with all fruits, pretzels, pound or angel food cake ... lots of other dippers too.
Now my favorite is savory.
A good white wine and gruyere
Beer and a mix of cheddars
A white sharp cheddar and dark beer
White wine and a mix of swiss and provolone
I like them all. Some, I will add some minor leaves; and some garlic - but, usually keep it simple.
Dippers ... all the veggies, small boiled new potatoes, bread, ham cubes, chicken, etc. Endless list
Then, I do an oil now and then; usually herb flavored to fry food it. Most often seafood or small pieces of beef because they cook quick. You really need to have an electronic fondue for this to control the heat to get it hot enough. I usually serve a variety of dippers with that. Almost like Japanese cooking.