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May have something to do with the crummy results for searches on google so people are switching.
I doubt if there's much switching going on, since Google's market share keeps growing, while Yahoo's has been declining a bit in the last year or so (at least if we're to believe comScore Media Metrix).
A more likely explanation is that your rankings have slipped in Google and improved in Yahoo.
From where I stand, Yahoo does not have much more traffic than MSN in general but I did not looked exactly over all our sites, I just know Yahoo in general is a little better (very little) than MSN and both so far from GG...
rest is total garbage inc. AOL, Ask and dogpile. Other search engines provide less traffic than any link from almost any site.
Admitedly, before the update, I was getting masses of good strong hits from Google. The strange thing is that my income from this site is only down by 15% and the emails I'm getting from real clients has gone up. I have always said it and still stick to my guns ... Google hits are mainly from webmasters, scrapers and people looking for free stuff. Yahoo visitors are looking to buy and MSN are info seekers. I'm actually a lot more relaxed this time around and if Google never takes me back, I couldn't care less :-)
All the Best