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I also noticed in Y! Site Explorer the number of our pages in the index has fluctuated up and down quite a bit this week.
I find myself using Y! search more and more, now that G's harsh algo has excluded so many innocent sites.
For example yesterday I wanted info on a particular motor race in the 70s. It simply wasn't listed in G, but I found nice reports, (on clean sites) about the race using Y! search.