OK. My mistake. Your shifter cable run goes to the down tube. It has a cable stop just like the one for the brake you photographed.
1. lift bike by saddle so that rear wheel is raised and pedal lightly so that rear derailer is properly situated.
THEN, follow Retro's cable loosening technique:
1. Shift into the biggest sprocket. (gripshift on the 1)
1.a. Pedal some while lifting the rear wheel so that the chain is on the biggest cog
2. WITHOUT TURNING THE CRANK shift back to the smallest sprocket position (gripshift on the 8, or as far as it will go). That'll make the shift cable go slack.
3. Now you can easily disconnect the shift cable housings from the cable stops.
To clarify step 3, pull the black housing forward. Then pull the cable through the slot on the cable stop. The cable run will now be free and will allow you to pull the shifter off the bar.
Technique for the brake is the same. Once you have the rear brake released (or just hold it shut as per FB), there should be enough slack that you can pull forward on the black cable housing and pull the cable out through the slot.
HTH
Last edited by LesterOfPuppets; 01-02-11 at 04:32 PM.