I'm not going to post anything but this link:
I needed this because I still use Property List Editor to edit and save binary plist and strings files. If anyone knows how to do this with Xcode 4, please let me know.
NOTICE: I tried to open my .strings file AFTER I opened and saved it in Xcode 4 and it was corrupt! YIKES!, fortunately I made a copy before and was able to open that file. So initially there is a problem with binary plists (a strings file is just a plist) inside Xcode 4.1 on Lion. The Xcode 3 Property List Editor can read / write plain (text) plists and binary format.