I remember seeing some early laser based projectors awhile ago that produced something reasonably usable inside during day time. But that was 7 or 8 years ago. I've heard that there are some laser-based pico projectors about to come out, they might be better vs. an LED based projector.

There's some tiny bluetooth keyboard projectors that now use green laser light and are very bright.

Here's a vendor that apparently sells them (but I couldn't find any pictures of the green keyboard versions).

Some of their interesting devices

http://www.ctxtechnologies.com/products/misteex/

http://www.ctxtechnologies.com/products/vk300-iphone-docking...