10.3.8 update sets off Mac fans... literally

Both the Apple discussions board
and Macintouch reports issues with G5 fans after updating to 10.3.8. The fans appear to spontaneously rev up quite loudly at as-yet-undetermined times – one reader reports fan revving during bootup, another during Entourage mail check, even one reported revving fans while scrolling in Safari.

So there seems to be some association of fan revving with application usage across the board, perhaps. Has anyone who updated seen this?

(Thanks to Michael for the tip!!)