Something like keepass. Could be real simple though.
* unique id
* zimbra user id
* Easy to recognize name for link
* url to logon page
* username field name (from html page to simulate post)
* username password field name (from html page to simulate post)
Might require some IT install work like setup a mysql database to store all the info.
1. User right clicks on the zimlet shows list of web sites that have been entered. User
2. single click or double click open the add new website form.