SL just passed the 300k active users on the main page.
That is a growth of more then 50k in just the last 17 days. Even a bit more, because after we passed the 250k the algorithm got changed and it dropped below 250 again. With this speed we will reach 400k by the end of next month.
Tateru just blogged this a bit faster then me here. She has some more number of the last couple of days. She also blogged tuesday that sl hit over 8k concurrent users for the first time.
Sl is booming, ride the wave or be swallowed. Or just enjoy the waves from afar. ;)
Edit: I made a math mistake.