Now, just from my Gmail account I made years ago, I have access to my own calendar system, document hosting, software project hosting, personal website, and blog. That's just the things that I've personally used my account for. Now that they're even making their own operating system, customized netbook for it to run on, and even their own programming language, pretty much the only thing they don't have is a Flash games site.
With how many places they are, I'm grateful they're mostly just acting as good alternatives for nearly everything else. To demonstrate how many other options there are besides Google, I've made this table of stuff they've made and a few alternatives for each.
|Topic||Google's Product||Other Product 1||Other Product 2||Other Product 3|
|OS||Chrome OS||Windows 7||Kubuntu||OS X|
|Photo Editing||Picasa||Photoshop||The GIMP||Krita|