Another owner here, and mine is probably one of the oldest ones on the road
Bought he baby on Jan 19, 2004
Upgraded the hard drive to a Hitachi travelstar 7K60 the week after.
No additional upgrades for over a year and a half. CD-DVD combo replaced with a Pioneer DVR-K15, and 3 months later one of the 256 MB sticks replaced with a 1 GM simpletech PC3200. No additional upgrades.
As everyone already mentioned, our old and trusty M68xx is still faster than many new...