Windows with Outlook: Sharing a Google Docs file for group collaboration can be a lot more useful than emailing individual copies to an entire team. Harmony makes opening, sharing and managing Google Docs from inside Outlook a natural fit.
The free plug-in opens as a right-hand sidebar when you click its toolbar icon or launch it from your Start menu. Sign into your Google or Apps account, and your documents show up, ready for opening, sharing or other use. Buttons at the bottom quickly toggle your view between documents, spreadsheets and other files, and the PDF mode, in particular, might be a help for those who are all too handy at losing the right document at the wrong time.
Harmony also sports a similar Sharepoint integration sidebar, though we lack for a Sharepoint server at Lifehacker East. If you've used that feature, or found clever uses for a combined Outlook/GDocs inbox, tell us about it in the comments.
Harmony is a free download for Windows systems running Outlook only.