I love Google 411 - it is one of the best enhancements (application?) for my smartphone. SmartPhones are great but as anyone who has 
used one while driving can attest they can be dangerous. With great power comes responsibility! I will admit that I've used Google Maps for Mobile and Windows Live Search Mobile while driving- NOT SAFE. Yes, Windows Live Search has added voice commands but they don't seem to work very well for me. Oh well, I'm sure MSFT will get it nailed. Until then I have my phone setup to voice dial Google 411- all I have to do is say "Call Goog" and my phone dials the number. Once connected I've never had the service let me down; it always understands what I'm asking for and the results are always relevant. One of the coolest features is that you can say "map it" and the service will send you a text message (pictured at right) with an address for the business and a link that will open your mobile browser and allow you to get driving directions or see a map of the business that you are interested in.
Thanks for the tip on mapping, LifeHacker: Mobile Phones: Map it with GOOG-411
1-800-GOOG-411 has added a new feature - the ability to get maps of the businesses that you're looking for texted to your mobile device.
All you need to do is call the number, say "map it", and the text message will come to you with a map of what you're looking for right there on your phone. It's an easy way to figure out where you need to go
Google just freakin' rocks. Hmmm... I wonder how long it will be before the major carriers file a lawsuit against Google for lost revenue or some such made up lawyer talk... since no one in their right mind should ever pay for 411 service again.