We are following this new product on SugarForge for awhile. Many of promising developments on SugarForge often die because of lack of interest from the users, but it looks like this one from Italian company is going to have a future.
The latest version of the product is working with some bugs. It is free, but it requires users to register their Google and SugarCRM credentials on Opensymbol's server. From our point of view it is major downturn, but the company is promising to introduce a new version with OpenID in March, so we won't need to give up any security info with the use of the product. We are eagerly looking forward to this.