Google Docs vs Insync

Google Docs
Google Docs is a free, Web-based office suite, and data storage service. Documents, spreadsheets, presentations can be created with Google Docs, imported through the web interface, or sent via email. Documents can be saved to a user's local computer in a variety of formats. Google Docs serves as a collaborative tool for editing amongst in real time. If you are looking for self-hosted open-source Google Docs alternative, pay attention to ONLYOFFICE.
Free file synchronization and sharing service for Google Docs/Google Apps users. Works on PC and Mac.
Face to face in the news:

2011 - Google Docs allows to preview archived docs to strike back at Insync

Google Docs archive

Perhaps this news won't make most readers very happy, but for editors of informational portals - it's a real holiday. Because every day they receive a lot of Emails with news from different vendors. And there are some PR-specialists, that not only sending news as attached word documents, but also pack them in archives. Reading these news is a pain. Now it will be much easier because Google Docs has added the opportunity to view archived documents without unpacking them. GMail users can open these archives directly from the email. Both Rar and Zip formats are supported.