What's working:Clickable offers for members visiting your area - Coupons, downloadable avatar accessories for basic information or taking a surveyClever updates- Think virtual billboard tactics where your images and message change on a regular basisPersona avatars to greet and discuss your product in the context of the site and member conversations (i.e. subtle references and recommendations, not hard sell)One off events built up with lots of publicity - for an idea of what I mean, look only as far as CSI using Second Life in its television shows. While a coup for Second Life, the buzz for CSI was pretty good and I'm sure it drove in some additional younger viewers who didn't previously watch.