The following notes mostly affirm what others have said... my contribution being mostly point 4...
1. Being in the Yahoo directory appears to be of some help, and in my experience, it seems there may be an added bonus if you are a commercial site and pay their $299 annual fee for inclusion.
2) Yahoo is slow to deep-index and update. I have had one client online for 13 years now, and every so often I see a Yahoo movement that might be explained away by "other stuff" like algorithm changes, new competition, etc - but it seems like sometimes 6-9 months is required for major changes to get properly indexed and displaying in SERPs with full power.
3) Overture has no effect, per my "last 180 days" experience. I ran KW analysis prior to and after a $10k spend on Overture for a single domain - but there was little or no change 30 days prior vs. 30 days post (no big leaps). Again, one site, one test, but $10k ought to have made a difference if Overture has an impact, and I saw no indication of this.
4) Keep in mind that while Yahoo, MSN, Google are ranked in that order in terms of "reach" and use as general portals/sites, in terms of their use as a search engine, Google:Yahoo:MSN per last stats I can find run about 11:4:3 in those "used for search" figures. So having 70-80% of hits coming from Google is skewed a bit, but not as much as if you forget to adjust for that approximate ratio...
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