As is the case with the majority of people who participate in this forum, I use DP's KWT daily and decided to create a similar tool that checks Google, Yahoo, and MSN more or less to prove to myself I could do it. But as I get further into its development, I'm faced with the possibility that it may become popular so I decided to look into the legalities of it. Does this mean I need to write Google and ask their permission? If so, what are the odds that they will grant the permission? (Sorry if I asked a stupid question, but I've never been very fluent in legalese.)
If you use the API you'll have no problems at all. However that is limited to 1000 queries a day. http://www.google.com/apis/ For more info.