I'm in the planning stages of a home theater setup. What do I need to run to the tv so I can hook up various components? I planned on running power, HDMI cables, RCA cables, coax, and an ethernet cable. Is there anything else I need? Can I run the power in one conduit and run the rest in another conduit or do they need to be run in separate conduits?
As for what wires to run to the TV, it entirely depends on what you plan to hook up. If you're going to have a receiver set up (e.g. to power surround sound speakers) you can run all your devices to that, and only have a single HDMI from the receiver to the TV (plus power). If you're going to run all your individual devices to the TV, you'll need to take a look at what you have.
Running conduit is a good idea so that you can pull more cables later on. I wouldn't install a bunch of extra stuff just on the off-chance you might need it. Make a reasonable plan now and decide what you want. In 5 years there may be entirely new standards so it would be a waste of time and money to try to speculate. Conduit with a little extra room is the best future-proofing.