I wrote a script that uses an existing jabber account on the n900, and a server to enable pushing information to the device. This currently supports push updates of new messages to the n900 (essentially push email for any email account, gmail, yahoo, etc without the battery, etc downsides of nokia messaging). In the future it will support push for other applications, such as TOR. I am trying to gauge interest to decide if cleaning up the code to release it is worthwhile. If there is, I would clean it up, and make it more user friendly. (In case anyone doesn't know, push is where the device is notified of new emails / other information instead of checking every x minutes to see if there is any new information.