i tend to mix very much as i go along
i don't really subscribe to all this plug in processing.
i think you should do all that at the cut really
i think cutting rooms have the analogue gear that the software guys try to emulate anyway. so why not use the originlas and talk to the cutting engineer about your mix at the same time.
tend to start all midi and analogue and mulitrack stuff to the mac as i go along
including effect sweeps and filters etc.

one thing though
i read an article with a famous breaks and house producer (sorry lost th name) and he made a lot of sense
he started saying that he used to use a lot of eq
but now he spends more time getting the source sounds right and really trying not to use too much eq on the channels
i sort of agree with this 'cos you can process all the "life" out of a track by just doing too much to it.

sometimes i break down the mix once i finished the arrangement
but on a good day it does itself as i go along .