I bought a Wolfcraft Jigsaw Table in July 2013. After purchasing it and finding that the Jigsaw Blade wandered about it made sense to buy a blade guide arm. Wolfcraft used to make one but I couldn't find one for sale. Using the metal from an old sofa bed frame I made a guide arm with roller boot wheel bearings to guide the saw blade.
The final result, crude as it is, can neatly cut wood as thinly as 1mm.
The photo's were done very hastily so pardon the quality :s