Been playing with this http://www.skybound.ca/stylizer/ CSS editor lately, and it has some really nice features:

It has a drop down to indicate only certain style elements appear in certain browser flavours:

That’s pretty cool. I just use a bookmark for that at the moment (http://www.noupe.com/better-design/7-css-hacks-you-cannt-live-without.html) but IDE integration would rock.