"Second Life" and apparently anything with the words "Second Life" in it are trademarks of Linden Research, Inc., which is often known as Linden Lab. All terms, references, etc. are used with the utmost respect and deference as I enjoy my Second Life account and have no desire to see it suspended or revoked.
"SLArt," however, is the trademark of Richard Minsky, so Linden Research, Inc. is going to have to suck it up and deal on that one.
By the way, does anyone know how to make those little "tm's" or "circle r's" on their blog? I genuinely have no idea.