2. Company Buzz

This LinkedIn-developed app strives to help you track your company's image online. It's also a fun app for all you gossipers out there looking to get the latest dirt on your company. It pulls in information about your company from two places. The first source: other LinkedIn users who post information to the business social network about the company. The other source: , the microblogging service that allows users to share short messages of 140 characters or less. Many companies have begun .

3. Box.net

Box.net is a service that allows you to store and share your files online. It brings a collaborative, utilitarian, let's-get-some-work-done usefulness to LinkedIn. Via the service, you can share a plethora of documents, including Word, Excel, PDFs, video and other digital files with customers or co-workers, for example. To utilize the service, you'll have to , which is free for up to 1 gigabyte of data.

A word of caution: while Box.net does have privacy settings that allow you to control who can access your files, it might be helpful to view your public profile on LinkedIn and check out the Box.net widget. Make sure you didn't just share your new sales pitch with your competitors and the rest of the world. (Your IT admin would probably have an ulcer if he knew you were storing that document on Box.net anyway, but these things happen).