I've been out of the web-dev game for about 2 years now. I did a little reading and experimenting with this last night and had no success at all with giving a single class/id division multiple backgrounds. I tried a basic square division attempting to give it 4 rounded corners and appropriate padding.
Each time I went to add a second background however, everything seemed to stop working browser wise (Firefox/Opera/IE6/SwiftFox all run in Ubuntu:Gutsy).
Did I miss something or is CSS3 not fully a good idea to start building sites by yet?