I think it would be very useful if you simply could tick events or contacts and then perform an action on them (delete, for instance), as you can do in any webmail. I have been trying to import calendars and contacts, and the results were awful sometimes, so I had to go to the database to mend it (dangerous), or risk hours opening and deleting the contacts or events one by one. To sum up, I think that easier management of contacts and calendar events would be really welcomed.
Very good work. By the way, I am trying to convince my boss to use phpgw.
Greetings