Mounting a projector screen
Get yourself some shelf brackets and attach them to your wall into studs. Work out the spacing of the brackets for your screen. The brackets look like this:



Attach some 3/4" hardwood (oak, maple, etc.) planks to it to make a nice looking shelf. Attach the screen underneath the shelves which should conceal the hanging brackets and give you the clearance away from the wall you're looking for. You may want to drill a hole through the shelves and attach the screen using bolts and nuts instead of screwing directly into the wood shelves. You can also use the shelf to display some cool movie knickknacks.

You could also build something fancy using a French Cleat if you have the skills and tools.