It needs to be able to handle notifications MUCH better. I JB my phone mainly for use with iRealQuickSMS. I want to be able to reply to a message from within the pop up notification so I don't have to stop what I'm doing and close it out completely. Also, there should be a notification bar at the top that shows you all the different notifications you have missed (missed calls, voicemail, email, etc). There are JB apps that are trying to come up with ways to do this but if Apple just jumped on board and worked it into the OS it could be so much better. Oh yeah, allowing backgrounding needs to be implemented too. At least let us run 1 or 2 apps in the background. I'm running backgrounder and I can run Pandora, GPS, BeejiveIM all in the background while I'm checking emails and there is NO lag at all. Yeah it kills the battery but the only time I run all that is when I'm in the car and plugged in anyways. As far as the springboard, I still like it. Maybe somehow introducing Categories or some way of grouping icons into folders would help make it easier to manage, but besides that, I like how it is now. That is ALL I would need in 4.0 and I would be extremely happy.