Oh, yeah. A problem that I always had last year was with assigning homework in advance. I was assigning work from the day's lesson, as more practice. The problem was that I had trouble assigning work in advance, since I never knew in advance how much or what I was going to cover. And I had to make print outs in advance. but what I'll do this year is stagger the homework so that it's more practice on things that we've already done in class.
I came across this (in retrospect, fairly straightforward) idea when reading this awesome piece from Henri Piciotto.
I like this because it gets at two of my problems at once: my organization and clarity issue, and my retention issue.