Aside from Gmail (which I have been using for more than a year now), there is one other Google tool that I can’t live without – Google SMS.
I have one of those old Verizon phones and I don’t pay for web access or data, so my only way of tapping into search is through SMS. Ever since Google SMS launched, I’ve been using the service to find local restaurants, movie times, directions, phone numbers, etc. It’s replaced 411 as a more efficient and lower cost alternative to finding phone numbers for businesses.
I’m sure Google will start placing advertisements on text messages to monetize the service soon, but in the meanwhile – I’m enjoying the ad free service. It works and I can’t live without it.
Google even offers a wallet sized tip sheet(pdf) you can print out for Google SMS.