Yesterday: New record -66.429 user simultaneously online-

www.massively.com permanently tracks Second Life® data.
I just picked out some "New User online records"in approx. monthly interval:

30th of March 2008: 66.429
24th of February 2008: 64.305
27th of January 2008: 62.263
December (no data)
25th of November 2007: 57.925

Not bad...:)

All data www.massively.com