Just thought I'd post to say I've written an update for the NoAccessorySplash tweak for iOS 5 called NoAccSplash.
You can find the release info here
Quick and simple: NoAccSplash removes the Accessory Connected screen from the Music app when you plug your device into an accessory that takes over playback controls.
(Couldn't find iOS 5 specific forums so i posted it in General)

