Use the most often:
I think our George Forman Griddle gets used the most (and probably the cheapest appliance!) Everything from pancakes, to bacon, eggs, hamburgers, grilled veggies, steaks, other meat. Pretty much anything you can cook in a pan or on a BBQ we cook on this thing! Oh and our air popcorn popper, that's probably a tie for first place!
We "often" use our toaster, breadmaker (sometimes more often than others) and hand mixer.
I love and wish I used more: my Kitchen Aid (only really use it for icings or the odd cookie dough), my electric kettle (love peppermint tea but after 5 years of pregnancy and nursing I keep forgetting ;) ) and my Magic bullet (LOVE this and it used to get used way more)!
Have and rarely use, probably could get rid of: Blender, Icecream maker (should have just bought the Kitchen Aid attachment), Coffee Pot, Small Electric Skillet/Wok combo (used to use more but the GF griddle is 100X better), Tupperware QuickChef.
WANT: Either a Kurieg or Tassimo (We don't drink coffee and we don't use the coffee pot because we can't really make it either. If I got one of these I could get rid of the coffee pot and the kettle and our family and friends would be MUCH MUCH happier ;) And I would use it for hot chocolate and tea as well), toaster oven (always wanted one but DH says no... I am positive it would replace the microwave if I got one) and a rice cooker. Oh and if I start making more cakes then I would eventually like a second Kitchen Aid as it would make icings WAAAY easier (plus I want one in a pretty colour, I like my grey/silver, but I want something fun!) and the perfect waffle iron, the one we had growing up make the perfect waffles, not to thick and perfect texture. I haven't been able to find one that makes "my" favorite size waffles (I don't like the "Belgium" Size)