Google has launched many services for particular users over the years: search, gmail, Google Calendar, Google Reader, Google Docs, Google sites, buzz, finance, groups, iGoogle, etc. The list is really impressive and you can use all this for free, but that's not the point of the post.
They have gone one step further in making the adoption of Google Docs much smoother. Now you can edit your documents with MS Office applications and save everything into the Google Docs cloud. It can save only to Google or it can keep a version localy and a copy in the cloud. You can also keep versioning of the documents if you want. You just need to install a plug-in for Office that you can find here
This way, as you work with your documents more and more of them end up in the cloud and available every where you go.
Same tools, same computer, cloud storage. Transparent for the user. Isn't it clever?