It all started, for me at least, as innocently as you have a gmail account. And suddenly, checking my mail today, I am looking at an option such as “spreadsheets” what Option spreadsheets?. K, I click on it, and what I find? With that I can create small spreadsheets in the service, to have them always available and share or work with anyone. That is, in reality, a wonder (open Labs on the 6th of June)
And then I got a tour of google labs. And, well, the guys at Google are the best (Google Notebook looks interesting).