Well, they are cute... the Hello Kitty one probably appeals to a lot of folks, and Phiten definitely has the sports fan market covered with all the team logo stuff.
http://www.phitenusa.com/
If I need more titanium in my life, I think I'd buy a ti bike...
http://ticycles.com/ (Mmmm, TiCycle Steilacoom, delicious!)
The Phiten necklaces aren't too expensive and they do have some pretty nifty designs. Wouldn't hurt to try one, and if you like the way it looks at the very least you have a pretty necklace!