My computing life would be very different without Google, and my financial life would be too had I bought stock in Google when they went public!
I find myself using more and more tools put out by Google. Everything they release turns to gold. For example, I was asked to give a presentation about web-based resources for scientific research. Practicing good "presentation zen", I immediately asked myself who my audience will be. I knew most of them but I didn't want to make any assumptions (you know what happens when you assume right?). What did I do? I set up a Google Form in 10 minutes, sent it to my audience via email, and within two days all my questions were answered. I had the info I needed to plan the content I needed to cover and what I didn't need to cover. I also gained insight into how many PC users there were.
So, what are your most utilized Google tools?
The keen observer will have noticed that this survey is in fact a Google tool called a Form. Embedding of forms was just released this week!