Tip: Instead of dialing 411, dial 1-800-Goog-411

Goog-411 (this one is a service, not software)
http://labs.google.com/goog411/

Google is experimenting with a new service that coincides with their local directory databases...Goog411, a free phone directory service which looks like it may have a lot of potential.

From the website:

Welcome to Google Voice Local Search

Google Voice Local Search is Google’s experimental service to make local-business search accessible over the phone.

Using this service, you can:

* search for a local business by name or category.
You can say "Giovanni's Pizzeria" or just "pizza".

* get connected to the business, free of charge.

* get the details by SMS if you’re using a mobile phone.
Just say "text message".

Dial from any phone
1-800-GOOG-411
(1-800-466-4411)

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. We’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.

To find out more about getting GOOG-411 and other Google products on your mobile device, visit Google Mobile web site.

For more information, go to the website: http://labs.google.com/goog411/