I'm not sure how much this helps, but there is a search API that you can use without Google blocking your request and without the need to change your IP address; although there are some restrictions here as well.
http://ajax.googleapis.com/ajax/services/search/web?v=1.0&q=AnT4i
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see http://googlesystem.blogspot.hu/2008/04/google-search-rest-api.html