Using a projector myself, I'm a little confused by this thread. Running a coax out to the projector probably isn't an option, as projectors rarely have a TV tuner to decode the signal. It all comes down to what sort of inputs the projector has, and what sorts of outputs your cable/satellite box has. Generally projectors take HDMI, component video, S-video or composite inputs (I list these in terms of decreasing quality). A lot of this depends on how old and expensive the projector is. Likewise on whatever gizmo you're getting your signal on. After that its getting the right cable to get the signal from A to B.
One thing I'll caution you on is that the picture will look like shiite if you're trying to project a SD image (480p) onto a large area (e.g. a bedsheet). Then again, if you have enough beer at your party it may not matter (an analogy on how the opposite sex looks more attractive right around last call). Also, I believe Blockbuster stores rent projector packages, although the library suggestion might be cheaper.
