Google Maps surpassed MapQuest over the weekend in terms of monthly visitors according to Hitwise numbers; a couple of other reports had Google beating MapQuest back in January. I guess it depends on the methodology. Via All Points Blog.
Update: Richard Marsden has a bone to pick with these reports, which he calls “about as useful as the political poll over-analysis in the run up to an election. … Suffice to say MapQuest and Google Maps both have about the same share of the consumer market, and that should be good enough for the rest of us.”