I use it all the time, for practically every attribute. However, I've been thinking; are there some browsers that can't read something like...
background: #cf3 url(i/bodybg.gif) no-repeat bottom right fixed;
I'd be interested in knowing, because I notice a lot do each attribute on their own.
I think they are pretty well supported by most modern browsers that support CSS.
Browsers in around the IE4 and NN4 time may have problems with some shortcuts as they have limited CSS support. Sorry I can't be any more accurate, hopefully someone else has more info to share.