I've actually got the same thing going on right now. I was thinking it might be a wheel bearing too, but the anti-rattle clip sounds more plausible because I've noticed that the noise goes away when I apply the brakes, and returns when I let off. I haven't had the chance to check it out yet because it's too darn cold here right now.

01 Convertible; Electric Fan; 3" Up Your Kia lift spacers; Tj 104's; 31x10.5x15's on Centerlines; Rear LSD.
GONE, all I have left are a few spare parts and the wheels.