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Seriously though, for personal use ATW.
IId keep an eye on AV as well.
They are improving every day on our referral logs.. and any search engine smart enough to recognize the importance of our site, must be pretty intelligent..! :)
The one that drives my clients the most traffic.
For me, in conjunction with Google, that's been MSN/Inktomi. Without Google, even though it would mean a reduction because of how the keywords have to be chosen, that's who I'd concentrate on. Even with Google, that's a winner for traffic on certain type of keywords.
For personal use it would be ATW, whose interface far surpasses any of the others. They're the only ones who come close to Google's excellence in simplicity, ease of use and page loading time.