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Any hint? Thanks
Another alternative is a service like Hitwise, which buys the log data from a bunch of IPs. This data is supposedly much more accurate, but watch out - it has a big price tag!
If you want to try something fun, check out the keyword tool at Spyfu-dot-com. You can enter one of your competitors' URLs and they return a list of their keywords - both organic and paid. I seriously question the accuracy of these lists, but I've used it to come up with a few humdingers I wouldn't have found anywhere else.