Hmm, I've usually got 'the book I'm reading' (The Fourth Bear by Jasper Fforde), then 'the book in the loo' (which has been Samuel Pepys diary for a while now....), and then 'the book at work' (Triumph of the moon by Ron Hutton).

I only really read this way out of sheer convenience. I travel mainly by bike, so I don't bother taking a book with me (partly 'cos it's not like I can read while I cycle, but mainly 'cos there's a large chance of the book getting wet, no matter how many bags you wrap it in - this I have learnt from experience....), hence the book at work, and I hate having nothing to read whilst I'm sequestered in the loo.

Nothing so organised as swapping books chapter by chapter. Mind you, I may try that in future for books I find hard work. Cheers MacGrath!