What do you think is the best Google product or service?

I'd have to say their email is exceptional. People were really skeptical at first, but I don't see why really. I've always counted on and received great service from Google. Great work guys!

Easily the serch engine, it is one of the greatest services on the web today, ming you i like adsense also... if only they payed through paypal...

I would say Adsense/adwords the two main thing Google have. Without it, is just like Ask Jeeves

I think adsense is their worse feature. I have seen so many complaints regardless of being banned or not.

But as their best feature, I would have to say would be their search engine for images. Much better than Yahoo's

I love their searches.
But seems that it is having problems recently.

I'd say Google's best product is their search engine.