I don't bother anymore (I did with my first two children, but not with DD). I sterilized bottles and dummies before first use, then washed them in warm soapy water thereafter.
I did some research and discovered it's no longer considered necessary. Apparently sterilization is a left over from days when water supplies weren't reliably clean. Those of us breast feeding can't sterilize our nipples (ouch!) and babies cope just fine.