I didn't find a solution in the web, so I'm asking here.
I am using authoryear-icomp style for my bibliography (without any modification). When I have a BibTeX entry like:
@online{guizzo_i-limb_2008,
title = {{i-LIMB} snatches {MacRobert} Award - {IEEE} Spectrum},
url = {http://spectrum.ieee.org/automaton/robotics/robotics-software/ilimb_snatches_macrobert_award},
abstract = {{IEEE} Spectrum},
journal = {{IEEE} Spectrum},
author = {Guizzo, Erico},
month = jun,
year = {2008}
},
I get the URL twice in the bibliography. Once in the url field with nice linebreaks and once rudely running into the margins:
Guizzo, Erico (June 2008). i-LIMB snatches MacRobert Award - IEEE Spectrum.
http://spectrum.ieee.org/automaton/robotics/robotics-software/ilimb_snatches_macrobert_award.
URL: http://spectrum.ieee.org/automaton/robotics/robotics-software/ilimb_
snatches_macrobert_award.
How do I get rid of the entry not starting with URL (that is the one without linebreak)?

-in your title (MacRobert Award - IEEE Spectrum) by an en dash--or em dash---. – doncherry Jan 12 '12 at 01:01