Photojojo has devised an awesome way to turn your phone into a mobile projector screen.
"Basically, you start by cutting a hole out of one side of the shoebox to match your magnifying glass and taping the glass on the box. Then you make an iPhone holder from a paperclip, flip the screen display on your phone (to account for how images passed through a lens get flipped), position your phone inside the box (playing with placement until you get the clearest image), put the box top back on, turn the room lights down low and the brightness on your phone up high, and revel in your resourcefulness. Doesn't get more accessible than that!"
"I have a good cellphone with all these neat features, but I couldn't find a cheap bike mount for it, so I decided to build one of my own! I've just used cardboard, a lot of black extra strong gaffer tape, about ½ meter (~1' 8") of velcro and a piece of sponge that sits on the back, between the handlebar and the bike mount as a shock absorber."