I use Safari 99% of the time. The only time I use FF is when I need to grab a video off of a website like Youtube or something. I have not seen a Safari Plug-in that will do that. If there was one I would never use anything but Safari.
Opera 10 beta. it's great on a pc, even better on a mac. (plus built in bittorrent) it also has a great download manager. does anyone else notice safari 4 running at a snail pace on ppc? (ibook g4) its almost unusable.