For the last few weeks or more, I noticed that my mouse pointer will act strangely on certain sites in Safari. If I click and hold, the mouse arrow will erratically and rapidly toggle between the normal arrow and the "link finger" pointer. As a test, go to
http://sports.espn.go.com/espn/page2/index and click and hold on the big white "2" at the top of the page. Does it happen to you?
I've been able to reproduce this on a PB G4 1.67 and an iMac G5 2.0 both running 10.4.7, no hacks or anything installed on either.
It doesn't happen in Firefox or Camino on either machine. It's just a strange quirk, thanks for looking if you do.