@Cris and everyone else
Finally got around to reading the legalese in the guidelines. Most of the stuff is pretty straightforward and ordinary so I'll skip to the salient stuff.
1. We can mention
SL all we want here as
SL (without marks) because you already have the "trademark" text at the page footer. The rule is either first mention in a textual reference (difficult to control on a forum) or trademark reference which you have.
2. The SLUniverse domain name does violate the usage rules so I strongly advise getting written permission. You should be able to given your "age" and prominence.
3. Linden Lab will not go after just any use of
SL. They will do so if your name gains the status of "
SL Associated Name" and then later gets used for non-
SL things, particularly other virtual worlds. To become an
SL Associated Name the name has to have been used in conjunction with Second Life. It will be a violation if the name is
later used for something else totally not
SL.
Here's a sticky part re:
SLU. This forum talks about
SL AND prominently about other virtual worlds thus creating yet another violation.
Remedy here is either to get dispensation from LL (not likely), or to put the other virtual world forums such as WoW and stuff in a forum under a different domain name (safer and more manageable).