The docks I posted in post #10 are retina (iPhone 4) friendly. EDIT : Just looked and all docks in this thread are iPhone 4 compatible, so please post the dock image you are trying to use.
If you have other docks that dont work, post them and I'll resize them for ya, cheers.
I actually dont think i tried the ones you posted in #10. Ill try and use one of those tonight. Do i still name it SBDockBG@2x.png if im using winterboard?