I completely second that. Indeed it's extremely annoying.
OTOH I wonder where they come from, since PM's reply mechanism provides the IMHO very clear automatic "Re^2:", "Re^3:" prefixes...
do people edit them manually? Only rarely do I (feel the need to) change the node title, and when doing so I include an indication of the previous one, after having been -rightly- bashed for not doing so.
Update: Oops, I had mistaken this for a recent post and hadn't realized it was back from 2000... I already forsee a cascade of downvotes falling on me... :-(