After I heard Microsoft's announcement of yet-another-interation of their search engine (named Bing), I went to look at the stats for kottke.org for the past month to see how many visitors each search engine sent to the site. I couldn't believe how dominant Google was.
Google | 262,946 | 93.8%
MS Live | 4,307 | 1.5%
Yahoo | 4,036 | 1.4%
MSN | 2,796 | 1.0%
It's a small sample and doesn't match up with Comscore's numbers (Google: 64.2%, Yahoo: 20.4%, MS: 8.2%), but wow. As a comparison, the numbers for a year ago for kottke.org had Google at 91%, Yahoo at 4.9%, and Live at 0.7%.