If you frequently use Outlook on your desktop and Google Docs for Web-based documents, the Harmony Outlook add-on for Google Docs offers the best of both worlds by pinning the "cloud" to your desktop. When in Outlook, Harmony will display your Google Docs in a sidebar. From here, you can open, read, edit, share, and create new documents. There are other benefits, too, like turning desktop files into new Google Docs from the Harmony sidebar, and dragging and dropping a Google Doc into an e-mail as either a link (the regular dragging action) or as a physical attachment (by pressing the Alt key while dragging.) Harmony also adroitly uses the built-in Google Docs conversion engine to save the files you drag from the Harmony sidebar to the desktop in your preferred format.
Harmony still has its moments of discord, however. Creating new documents wasn't instantaneous, and only some but not all of our Google and Microsoft Exchange contacts populated the recipient suggestions box when we went to share a document, even though Harmony uses each service's APIs (it's possible you may have more luck).
We're all for add-ons that simplify our workflow, and Harmony's beta scored high points for keeping our work centered in one location: the Outlook in-box. However, piling on the add-ons can slow down your PC's performance, so we'd only recommend the Harmony add-on for those who spend significant time with Google Docs.