This may not be the type of program you are looking for, but for my class reunion we used http://www.classreport.org Feel free to check out my class website. http://www.classreport.org/usa/ma/bedford/bhs/1996/
As the class administrator, you are able to track addresses, phone numbers, e-mails, and more. It is also FREE!!! Woo Hoo!!! Good luck with your reunion.