I agree strongly with the battery life argument. Its an important note to make that the battery is run down because of frequent wifi/edge use. I've seen accounts of pre-sdk iphone hackers making programs that ran the battery down in hours just polling for tweets every minute or something similar. That same hacker said that ideally there would be some sort of registration for wifi/edge time that would bring up a connection every T minutes and tell all the programs registered to that listener that they now have 1 minute of access to the internet to poll whatever service they needed.
