I love me a roast chicken with garlic & rosemary (delicious, if a bit fussy, version
here; the "past recipes" link there gives some good recipes as well.
My emergency roast chicken version involves making a dry mix of cumin, paprika, pepper, onion & garlic powders, plus a few dashes of cayenne pepper if I'm the primary eater (I use kosher birds which are pre-brined, so no salt for me; if you're using a non-kosher chicken, add salt). Rub the mix all over chicken parts and under the skin, and roast in the oven at 450 for 45 minutes. For whole chickens, butterfly the bird first. If you've got a particularly fatty bird, slice up some onions for the bottom of the pan when you're roasting. After 45 minutes, turn off the oven, and leave the oven door open a bit so that the chicken finishes cooking w/o drying out.
I tend to make the mix up in large quantities, and keep a stash on hand in the fridge.
For grilling, I marinate the chicken overnight in a mix of olive oil, lemon juce, lemon rind, chopped garlic and rosemary or tarragon.