I'm bored - so here goes from the catalog, anyway -
1997 - lost Ti-6-4 BB shell, added welded shift bosses, changed seat stays, small geometry changes, all use 4.3cm rake forks, a little heavier (quarter pound for most sizes)
1998 - top of seat tube is sculpted/curved instead of flat, chainstays lengthened
1999 - added integrated cable adjusters at head tube
2000 - new dropouts (with the cutout as an "L"), curved chain stays, engraved BB shell (with "Litespeed" written on it), slightly longer wheelbase, slightly lighter, fork rake change from all 4.3 to 4.5 (small frames) or 4cm (larger frames)
2004 - seat collar (instead of integrated bolt), clamp on front der., dropouts don't have "L" anymore, biaxially ovalized downtube, think it has an 1 1/8" head tube as well