Adam,
I just upgraded to CS5 and can't wait to get it up and running. I am looking forward to a bunch of the features. I have used PPro at home and like the Encore DVD. After Effects will also be interesting to play with. Unfortunately, my brand spanking new custom built powerhouse PC - got jammed up a bit - installing the Sony Driver and the Matrox MXO2 mini with Max. So - my Raid config needs fixing this week. Then I'll reinstall and get up and running.
Getting back to CS5 - I have'nt started running it yet. But I highly recommend
www.Lynda.com for training. I've been studying CS5 there and will be some more. You can also buy DVD training. Other than that, there's probably a bunch of Youtube videos for training. Lynda.com is best training site I know of for a bunch of software. You can sign up and basically pick and choose whatever it is you want to study.
I don't pay for it - it's being provided... so I don't know the cost.