Since iOS 4 allows wallpaper and multitasking, and iPhone 4 is available officially unlocked in many countries, we're curious why you're Jailbreaking this time around?
Better notifications? Glance-able information for the lock screen? Drop-down settings access? Themes? Removing Wi-Fi-only restrictions? Wi-Fi hotspot? AT&T unlock? What's keeping on the Jailbreak these days?