Another feature of Xobni is that it uses the LinkedIn API to connect my contacts with their LinkedIn profile. This sounds like a great resource, and I email my results to some friends, and immediately, one of my 6 friends responds that her information is just flat wrong. It says she doesn't have a LinkedIn account (which she does), and the phone number that Xobni says is hers actually belongs to someone that posted a message to a list serv a few months ago. So, it isn't perfect. But, 5 out of 6 isn't too shabby, so I'm not uninstalling it yet. Although Xobni allows you to correct things like the contacts' phone number and other personal information, it does not allow you to correct a wrong LinkedIn match. I'm hoping that Xobni figures out a way to fix this part.
Besides analytics and LinkedIn API's, Xobni also tracks files you've shared via email to your contacts, and it also shows your contacts' contacts. This last part is a little "iffy" sometimes, and needs a little bit of tweaking to make it better (there seems to be a lot of false contacts.)Although Xobni isn't the do-all to end-all, it does have some pretty nice features that can help you better understand your email habits. Once you've played around with it a bit, I think you'd find that it can be a useful tool. On a usefulness scale of 1 to 10, I'd have to give it a solid 7.