To name but a few:
Potato wedges - just cut up the potatoes, light dash of olive oil and any other flavourings you fancy (chilli powder, garlic, herbs, salt and pepper etc) then stick in the oven.
Roast little new/salad potatoes in their skins with garlic and rosemary (lovely tossed hot into a salad).
Boulangerie Potatoes - thinly slice potatoes, put in oven-proof dish, pour in a little veg or chicken stock (leaving top layer peeping out) and bake till golden.
Potato rosti - (grated fried potato) - just google for recipes
Mash with other root veg, such as sweet potatoes, parsnips, swede etc.
Also try different varieties. Sainsburys do Mayan Gold -bright yellow - make really crunchy fluffy roasties!
Oooh, making me hungry!