I use a lot of google services.
Gmail, Notebook, Documents, Tasks, Calendar, Talk, and more. In all these services, I can enter informations. Sometimes, I want to find an information, I know that I wrote something about a subject somewhere, but I don't know where. Is it in docs, notebook, tasks, or only in a talk conversation with a friend?
I suggest to Google to develop a global account search utility that will search all text of all my google services. That could be very useful.