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I don't know of any stats on who uses the different engines. I know that some industries seem to have more success with certain engines, but whether that's truly across the board and verified, I don't know.
Anyway, I like Web Snapshot for stats on the most popular search engines by Web users:
[websnapshot.com...]
I recently wrote to Media Metrix about an update on their stats, and I do have copies -- if anyone wants one, let me know. These are the top Portals and Search/Navigation sites according to unique visitors in April 2001. They're in Excel format.
Search Engine Watch has some statistical information as well.
I don't know if this is what you're after or not -- but maybe it helps a little.
Robin
Thanks!
Robin