In reply to Timmd:
When you are cross cutting (cutting across the short dimension of a piece of wood, usually across the grain) like that you use a cross cut sled, a perpendicular guide that runs on a rail parallel to the blade. This keeps the wood square to the blade and greatly minimises the risk of kick back, or having the blade bite into the wood and rip it from your grasp, which in turn greatly minimises the risk of losing a finger or three.
Also there should be a riving (sp) knife behind the blade, a fixed, blunt blade that keeps the materials from closing back up and again causing kick back.
Thirdly there should be a blade guard over the whole blade to stop squishy fingers getting too near it, and finally if the bit of wood is that small then guard or not, you should be using push sticks, a sacrificial stick that you use to guide the wood instead of your non-sacrificial fingers.
It's clearly a home made saw so a lot of this stuff is asking a bit much but there is definitely a safer way to do things, even with that equipment!