electronics vs. printed beta submission?

I do Word docs when asking for and doing critiques and such. It's easy and the track changes feature is what e-publishers use so it's a format I'm used to.

I've a lot of co-written books and I've done it two ways.

1--via a private journal (like LiveJournal). It's great for different time zone, the co-writer can look at what you've posted when they have a chance without going into email and downloading/opening up documents.
2--was "live online" via SKYPE IM.

In both cases one person kept the "final copy" that we'd edit then submit.

I've done it only by e-mail, preferably in a Word document. Comments are best made, for me anyway, using the comment feature in Word, with short summaries at the end of each chapter. As far as quantities, that depends. I've done it in 3-5000 word blocks, a few chapters at a time, or with sending the whole novel to be reviewed over a month or two. As long as you trust your beta to do the work, that's fine.

I'm a beta (only for a few friends). Although I like editing on hard copy, that gets expensive (both to print and to send back). I prefer to get the whole ms at once (after the author has done the best editing they can), and as a .rtf file. By using the .rtf format it doesn't matter what version of word or some other program either of us is using.

MM