Due to the captcha thing (which was just resolved by the blogger humans - thanks!), last year I started using del.icio.us to put up my links. I stopped after a bit, but you can see 224 very good links here:
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.