When 1.3 came out pistons had changed so that a one tick pulse didn't make a sticky piston either push a block forwards or pull it back. This caused many piston T flip-flops that relied upon this to stop working, however today while I was fooling around with some redstone I noticed that there were still some ways to make a single piston t flip-flop. This uses a pulse shortener and a sticky piston. The dimensions are 4 deep 2 wide and 4 high.
If you need any help with any computer issues, check my website for contact information. I also do Minecraft Mods... well basic ones, I can make blocks that do specific things. I've also dabbed into making Plugins... like before, simple plugins