I typically like to wait for Danny Sullivan to do his large chart, plotting all the various metrics companies against each other.
But Nielsen//NetRatings released (PDF) a report with new share figures. Here they are:
In the number one slot, as normal, is Google Search with a growth in search queries year-over-year of 44.9% and a search market share of 56.3% ending in June 2007. Yahoo! Search follows with a growth in search queries year-over-year of 18.6% and a search market share of 21.5% ending in June 2007. MSN/Windows Live Search follows with a growth in search queries year-over-year of only 0.8% and a search market share of 8.4% ending in June 2007. AOL Search came in fourth with a growth in search queries year-over-year of 5.1% and a search market share of 5.3% ending in June 2007. In fifth is Ask.com with a decline in search queries year-over-year of -2.8% and a search market share of 2.0% ending in June 2007.
Again, this is just one data company, I always look forward to Danny plotting them all over several months and years - so you get true perspective.
Forum discussion at WebmasterWorld.