Contact manager like plaxo. Works like this: 1) Install script on your PHP/MySQL server. 2) Use the system by pasting all of your friends' emails and bulk mailing them an invitation to fill in their contact information. 3) Your friends come and enter their information - it is automatically saved in your contact list. Your friends can invite their friends and so on. If someone's email address is already in the system, they will not be emailed - instead their information will automatically appear in your address book. You can also download your contacts in an excel spreadsheet. All of the contact lists are private - your contacts cannot be seen by other people and vice versa.