iPod Photos, PDAs with video output, laptops, and even digital cameras, have made the days of lugging around a bunch of slide trays and large projectors a thing of the past. You can plug many of those into a large TV or projector, and have an instant family history session, without having to lug a lot of hardware around (assuming you have a large TV or projector).
Now you can take things one step further, with Pocket Projectors – Texas Instruments has managed to shrink these things down to a small enough size they fit in one hand.
Now you can embarass everybody much easier at your next family reunion.