My T61 has a stupid Windows-key stuck between AltGr and Ctrl. It gets in the way all the time. I never use the key; my old R51 didn’t have it and I only use Model-M’s on my workstations.
To fix this annoying “feature”, put this line last in your .bashrc-file :
xmodmap -e "keysym 0xff67 = ISO_Level3_Shift"
Now that key is an extra AltGR-key ! Problem solved !