Ok, so it really isn't a hint, it's a feature :). If you use Safari and go to Apple's website, you can actually see a little Icon that says "Welcome Safari User" along with the safari icon.
[Editor's note: Yea, I know it's not a hint ... I still thought it was sort of cool, though many of you may disagree!]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030123060124788