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If google is their homepage, they'll just type the name of a website they want into the search box, not the address bar. Often complete with www....com.
Wordtracker (weekly top 500 email list)
AdSenseAdwords (pretty expensive for a list of 50.000 phrases)
KeywordCountry (haven't tried yet, quite impressive numbers)
AdWordsMarket - (cute - with seperate national databases per country)
Keep in mind that best paying is not the same as most searched and that most paying is very often derived from Overture bids and Google AdWords suggestions.