top of the pile:
breadmaker - use it at least 3 times a week. great for all kinds of bread, rolls, pizza dough. super.

also use regularly:
Kenwood mini chopper food processor - use it loads for making curry pastes and when i need really well-diced veg, or breadcrumbs

not quite so regularly:
Slow cooker - makes a nice stew but could probably do the same job on a low heat. takes up a lot of space

rarely:
ice-cream maker - used it twice - it made poor-quality ice-cream in really small quantities.