800-GOOG-411

Google Voice Local Search is Google’s experimental service to make local-business search accessible over the phone.
To try this service, just dial 1-800-GOOG-411 (1-800-466-4411) from any phone.

Using this service, you can:
search for a local business by name or category.You can say "Giovanni's Pizzeria" or just "pizza".

And it's FREE. Google doesn’t charge you a thing for the call or for connecting you to the business. Regular phone charges may apply, based on your telephone service provider.

Note: Google Voice Local Search is still in its experimental stage. It may not be available at all times and may not work for all users. They're fine-tuning the service to get better at recognizing your requests. It’s currently only available in English, in the US, for US business listings.