Made one out of 2x8x8, 3/4"x4' pipe w/flange. Cut the 2x8x8 in half. glue the two halves together. Then bolt them with carrige bolts at the ends (counter sink the bolts so they are flush).
On the bottom of your two attached boards, counter sink the flange with edge of the flange centered and about 3 1/2 inches from one of the ends. This is done to make the flange flush with the bottom of the glued boards. I used wood chisels and a dremel to do this work. This is the hardest part (tedious actually, not hard) of the build.
In the center, drill a 3/4 in hole at the center of one end about 4 inches from the end. Run pipe through, attach to flange, pull pipe and flange back up through the wood and screw the flange to the bottom of the boards. If you did this correctly the flange (and screws) will be flush at the bottom. You're done.
To lift bike, run the board under the bike just rearwards of the oil filter. Align with the frame. I do this from the clutch side. Pipe is now sticking straight up on the clutch side of the bike. You need to make sure the pipe will clear the handle bars in this next move.
Now roll the pipe forward and down, the wood comes up and your rear is lifted off the ground about a 1/2". Can be built for free with odd materials laying around or for about $15 from the local hardware store. If you have a peice of 4x8 laying around you can skip the cutting and gluing phase.
Great on the riding mower as well.