Andy_Langton - 11:02 am on Jun 7, 2012 (gmt 0)
The majority with Adwords data will be using the API, so totally above board. But the terms of service is a user agreement. So if you sent automated queries from your own PC, you risk that PC (or internet connection) being blocked from using that service.
Similarly, if a third party sends automated queries, they risk being blocked from using that particular service (e..g. if you mass retrieve Google SERPs you can be blocked from searching).
But there's no risk to the site involved in the queries.