SL Advertising Beta has ended, it officially ends on May 31st, but if you go to http://advertise.secondlife.com/ you’ll see the following message:
“Thank you for your interest in the Second Life Advertising Beta program. Based on our evaluation of the SL Advertising Beta during the last six months, we have decided to discontinue the program on May 31, 2011.
Thanks to all of the Merchants who have helped us test this display advertising beta and for all of your helpful feedback. Your participation and insights will help us drive our ongoing efforts to help you promote your products and services to Second Life shoppers. We look forward to partnering with you on future promotional endeavors.”
Part of the problem as far as I’m concerned is that Linden Lab didn’t promote this very well.