The Clarity Aloft headset is a light weight headset that uses the foam type ear pieces, I have used this headset for one year and although it doesn't use ANR, it keeps most noise out and has high quality sound and good microphone, also the headset frame goes around the back of your head instead of over the top and can be worn all day long without any problems, on the down side, it uses the squishy foam ear pieces instead of ear buds like on an MP3 player, it can irritate a bit and they are hard to clean.
Another option if you are after a one earpiece headset is the Plantronics light weight headset.