How to scrap google results ?

Hi,
My program scraps google daily. And between each scrap I put a random time delay to make it look natural. I also use different proxies. But still google notice it and redirect the result to sorry.google.com . My program works fine when scraping MSN and yahoo results. Any suggestion ?

Thanks

google uses cookies, so be sure to handle them

also look into using your own proxy server or paid proxies I think the public ones get abused a lot and get their ip banned.