the limewire software is quite cool, but these flashy adverts don't impress me much. But I guess , your are already SELLING a lot of ad slots, so why do the beta users who contribute to the project suffer from this ? Sell your PRO stuff to the click-only-users and accept that the keyboard-aware users CUSTOMIZE this product themselves. If you make the advert stuff more attractive (pay-per-click), nobody will be offended by them.

But this would be a totally different business model. Ever seen unwanted ads in Microsoft Internet Explorer, GCC or GNU Emacs ? They are free stuff also.