Karl Soulé at the Video Road has an excellent article on how to setup a ProRes workflow in PremierePro. This can be used for ProRes sequences from Final Cut Pro, or for projects shot in ProRes which is happening more often. It is too bad, you have to at the least Purchase the new Apple Motion to get ProRes codecs on your mac, but you need them (you have them if you have FCS 3.0) and with these setup settings you can easily work end to end in ProRes in Premiere Pro on your Mac.