Running 'xsetwacom set "Wacom Intuos3 6x8 stylus" TabletPCButton on' worked on my Intuos3 on 11.04 but disabled both stylus' side buttons.
In order to get them working again I only had to run xsetwacom set 'Wacom Intuos3 6x8 stylus" TabletPCButton off' and both problems were solved.
Running 'xsetwacom set "Wacom Intuos3 6x8 stylus" TabletPCButton on' worked on my Intuos3 on 11.04 but disabled both stylus' side buttons.
In order to get them working again I only had to run xsetwacom set 'Wacom Intuos3 6x8 stylus" TabletPCButton off' and both problems were solved.