i have been testing lion all day. i like better than SL. most of the times i use my mbp with another screen, used both screen simultaneously. Watching movies on the external screen and browsing on the mbp screen. on SL when i use to close the lid the mac will go to sleep. now with lion, it will not go to sleep. all widows will go to the secondary display and the mbp screen will turn off. i like it better that way, if you want to wake the mac screen, press detect display. and all the windows that were previously in the primary display will go back there.