Edit documents from anywhere... you can email the files to yourself, FTP, whatever. Not a Google invention.
, but it's much easier than uploading to FTP or emailing, then reading and find a mistake to change, then you have to email or FTP it again after you change it, plus you have to make sure whatever computer you plan to use has the software to read those types of documents (granted .doc is standard, but what if it's .docx and the machine has an older office version).
Apple didn't invent the "dap" but they made a store for it and perfected it (and have an incredible marketing team) and now nearly everyone uses an iPod.
Cloud computing is becoming more and more prevalent. Google is a main force in that.
I also love the Lala service. Scans my music and syncs my songs to it's library, and the ones I don't have are uploaded. Instant streaming music portability. There were ways before to make your music collection available anywhere, but Lala is the first I have found that makes it so easy and seamless.