There is another one which is quite good although a little more exposed and a bit flappy, but condensation is less of a problem. This time you lay your tarp out in a diamond shape, ie square where one corner will be the front, and the other will be the back. Peg out the mid points on the two sides that will be the back, then use your poles at equal height on the mid point tie outs on the opposite sides to the pegged back. So what you have made is a new square at 45 degrees inside your tarp, with a tringle left at the back (tuck this inside), two triangles at the side (peg these down) and one tringle at the front (use a guy on this to peg out infront a few meters).
This will create a lean too with sides, and a sort of admin area at the front. If you keep your ridge line loops on the outside, you can tie out another guy to pull the fabric from the middle out to the back to keep this more taut and less flappy.
Best way to imagine this one, is to get a square piece of paper, fold the corners into the center, pull two opposite corners out so they stick straight up and rest that on the table along one edge of these upright corners, and the corner on the top of this lean-to shape will be guyed out infront of the structure.
Again I'll try and find a pic.
http://www.ddhammocks.com/tips/tarp-tutorial
Look for the "Adirondack Wind Shed" and instead of using line, you can use your poles to keep the front upright.