Janine, there are two benefits to thinking about Jabber in this situation. First, for people who have unreliable or slow connections, it may help to do the time stamp on the client side. My upstate connection, for example, can hang for minutes at a time, and if I'm not paying attention it will sit like that indefinitely sometimes. I wouldn't want to depend on that for logging my time.
Secondarily, with the right conduits you could log task starts, stops, etc., using your pager, your PDA, etc., which I would imagine might be nice for some.
