Stand alone projector

The MP302 is a tiny (110g, 25mm thin) LCoS (640x480, 15 lumens) pico-projector that is powered from the USB port of your Windows or Mac computer. It also includes a small amount of memory (128MB) for short videos or photos (you need to connect the included DC power cable in this mode).

The MP302 is now shipping for $289.

The Atom is a 'cube' shaped pico projector that is very bright (50 lumens), and costs only $160 (or less if you buy more than one). It has an A/V input.

You can buy the Atom over at Chinavasion's site. Via Ubergizmo

The Toyjector is a new pico-projector, but the feature set is rather underwhelming: QVGA resolution, 100:1 contrast and only 5 lumens. It will start shipping towards the end of February 2010, and will cost $180. When you consider what you can get for $150 these days, this is quite expensive.

Via GadgetReview

This Mini-USB projector uses the USB port for power and data, and can only be used with a laptop.

It's available now for $149.

The RIOLED-Q is a pico-projector for business use - it's very bright, has 2 built-in speakers (3W each), has digital keystone correction. It can receive A/V, VGA and USB connections. It has built-in memory (not sure how much) and a SD/MMC card reader. It looks very unusual for a pico-projector... but it is rather small, as you can see from the pen beside it: 

It should ship in late February or early march, we do not know the price yet. Via PC Mag

Artec's new pico-projector is a stand-alone projector (no internal memory) with VGA, A/V and USB connectors. The USB connection is used for the display and for charging the battery at the same time.

Artec PH00-1

The PH00-1 costs $280, and is on sale now in Taiwan.

The Rainbow is a small USB powered projector - connecting to a computer (Windows or Mac) to get the signal and the power.

Apin Rainbow RB330

The RB330 costs $249, you can buy it at eBay. Here's a short video showing the projector in action, and here's the Rainbow product page.