There has been a new update to the Outlook companion Xobni that adds information from LinkedIn. It can now import pictures from the business networking site and also provides (brief) details on the selected individual, typically their title and company. This clearly only works where the email address that they have corresponded with you matches the one recorded in LinkedIn, nevertheless it is still a useful addition.
The Xobni blog also suggests that future updates will provide further integration between the two services when you are logged in but stops short of saying what this will provide.