I have been using the keyword tool for a while and find it extremely useful. However, I now read in the google T&C the following: http://www.google.com/terms_of_service.html ################## GOOGLE START ################## No Automated Querying You may not send automated queries of any sort to Google's system without express permission in advance from Google. Note that "sending automated queries" includes, among other things: using any software which sends queries to Google to determine how a website or webpage "ranks" on Google for various queries; "meta-searching" Google; and performing "offline" searches on Google. ################## GOOGLE END #################### Is it still ok to use the tools? Furthermore, google states, not to use the API commercially. What exactly does that mean?
The API has a different terms of service that prevails over the main Google TOS if there are conflicts: http://www.google.com/apis/api_terms.html