The portable Vivitek Qumi Q5 LED projector featured on The Gadget Show Christmas special last night (4th Decemer 2013) as a top gift for this Christmas. At 500 lumens of brightness, the portable Qumi Q5 looks great in the high gloss red colour shown and is also available in Black, White, Yellow & dark blue, so you can really stand out from the crowd.
Vivitek's Qumi Q5 battery dock was also shown docked in to the projector to provide portable projection without needing mains power. Be aware that the battery dock drops the projection brightness to 50 lumens, not the full 500 lumens that it is capable of on mains power.
For bright, portable projection at full brightness on battery power you may want to consider the new 300 lumen Pico Genie M400 projector. The M400 has an in-built rechargeable battery that powers your projector at full brightness for up to 2 hours, this means the unit is smaller, brighter, thinner and more portable.