To go to your profile page you can look to the very top right hand corner you will find the welcome, notifications and then "My Profile" Click my profile and it will then bring you to your profile page. At the top of your profile page you will see the tabs- Visitor Messages, About Me and Friends.
You can download someones vCard. vCard automates the exchange of personal information typically found on a traditional business card. vCard is used in applications such as Internet mail, voice mail, Web browsers, telephony applications, call centers, video conferencing, PIMs (Personal Information Managers), PDAs (Personal Data Assistants), pagers, fax, office equipment, and smart cards. vCard information goes way beyond simple text, and includes elements like pictures, company logos, live Web addresses, and so on. You can go here- http://support.microsoft.com/kb/290840 to learn more about the use of the vCard.
You can also add friends to your friends list and a few other things. If you have discovered something new you can do or something I haven't shared here that has to do with your profile page please feel free to share.