With this new Widget provided by Alfstore (www.alfstore.com), Jive users can now work and collaborate around Alfresco documents using Jive social features.
Screencam of the Jive Widget for Alfresco:
If you are looking for a desktop client to manage your Alfresco documents, you should evaluate the Fred application.
I saw a demo by Xenit during the last Alfresco DevCon, and this desktop client has really some good features, especially off-line document management options that are unique to Fred (as far as I know).
Short video here.
Also, you can view a free Webinar recording, with the latest features : here