Socialwok is a feed-based group collaboration application for enterprises that integrates with Google Apps. With Socialwok, Google Apps users can create their own private social network to share Google Docs, Calendars and Spreadsheets in feeds for their domains. Socialwok also allows you to invite external collaborators to any feed. All communications on a project are then archived in a single location and can be referenced easily using keyword search or feed directory browsing. Socialwok Gmail gadget integrates Socialwok user's home feed into Gmail interface. In addition, you can post to project feed via keyword-based email addresses, and Socialwok will automatically post message to the right place.
To try out Socialwok, go to http://www.socialwok.com and log in using your Google Apps or Google account info.