A pin prick, a needle stick, backache, joint pain: many of us are so focused on sewing we don't think about whether we're sewing safely; after reading some web sites below, you might be inspired to develop safer, healthier sewing habits. Some of the following web sites offer practical safety guidelines for all kinds of sewing, while others have tips for a specific tool or task.
Rx for Quilters: Stitcher-Friendly Advice for Every Body by Susan Delaney Mech (Google Books)
Sewing Room Setup for Healthy Sewing
Suture for a Living - Good Posture