What these pocket projectors lack is as important as what they have, and many presenters will be disappointed by their minimalist designs. None of the three has a lens cover, a remote control or adjustable feet for aiming the projector's beam. Plus, only the Dell M109S has keystone correction to square the image when it's projected at an angle.

Still, their miniscule size and weight make them very attractive in certain circumstances. Read on to see how they performed in my tests.

3M Micro Professional Projector MPro110

It's not the smallest or the most powerful pocket projector, but at US$360, the 3M leads on price. However, in my tests it failed to produce an image bright enough for a business meeting and lacked the creature comforts presenters are used to.

Long and narrow, the MPro110 measures a petite 0.8 by 1.8 by 4.5 inches, weighs 5.4 ounces and can be slipped into a shirt or jacket pocket. About one-quarter the size of the Dell M109S, it's slightly bigger and heavier than the Optoma Pico PK-101. Add the AC adapter and connection cables, and its travel package totals only 12.6 ounces -- although unlike the M109S or Pico PK-101, it doesn't come with a case.