Nikk Huet has been pimping his company's current efforts in SL with the remarkable "Tribute Island".
Memorial to British Military Personnel
Memorial to the two shuttle disasters
Tribute to A.A. Milne
An impressive recreation of the Muppet Theatre offices as a tribute to Jim Henson.
The main concept is allowing Residents to submit tributes for anyone who has died since 1950. The memorials will be rotated as the number exceeds the space. I highly recommend visiting.