I think the google ads on the main page is a great idea, as long as the main application is free of advertisements! I agree with the others that the adds are poorly placed if you look at http://www.mirc.net for instance the google adds, eventhough they take in a prominent place on the website, don't really degrade the overal feel of the website. But i support your efforts in making the main mIRC app add free! Even a google toolbar option in the installer (not sure how profitable that is) would be a better option.

$maybe