I have been working on a piece about the history of lawns and how they came to rule the suburbs. I keep putting it aside because I keep getting distracted by shiny objects. Now it is too late for Lenny, as Brian Kane has written a great post about lawns. I highly recommend reading it.
I can add that I found an article discussing "Quiet Mowing". That's right, if you want to mow the lawn at midnight, here is how to go to it without waking the neighbors.
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.