Thoughts? Keep the curtains closed. If you have daylight in the room you might as well project onto an old bedsheet.
Have a look in the screen forum for manufactures. For info I use a DRH screen, pics on my website.
The temptation is to think you can compensate by using a high gain screen. Unfortunately this doesnt help with lcd pj's as you end up with hot spots. Remember brightness isnt the problem with lcd its contrast.
From my experiences with lcd pj's total light control is the key. I have blackout blinds fitted to my bay windows but on a bright day enough light gets in around the edges to wash out the image by a considerable amount, so much so that I'm going to run the blinds in channels to cut the light down further.
hth