From the Official Roku Blog:
Earlier this year we announced the Roku Streaming Stick™, a tiny wireless Roku player the size of a USB drive. The Roku Streaming Stick plugs into an MHL port (looks like HDMI but actually powers and commands the Streaming Stick) on Roku Ready® consumer electronics devices, bringing Roku to a range of new products.

Today, I’m pleased to unveil the first product of its kind–the 3M Streaming Projector powered by the Roku Streaming Stick.

The 3M Streaming Projector uses the Roku Streaming Stick to provide access to the more than 600 channels on the Roku platform. Small enough to fit in one hand, yet able to project an image up to 120 inches, the 3M Streaming Projector is perfect for family movie nights, sleepovers and backyard parties.With up to a two-hour 45 minute battery life, the 3M Streaming Projector can project almost anywhere a Wi-Fi connection can be accessed – onto a basement wall, a bedroom ceiling or even a backyard fence.

The 3M Streaming Projector is now available for pre-order at Amazon.com for $299, and will begin shipping on Oct. 22.

For more information, visit 3M Camcorder and Mobile Projectors: United States.

Happy Streaming!™
Note: You can get $20 Amazon Instant Video Credit with Purchase of the 3M Streaming Projector Powered by Roku, now through October 31.

I checked this out, and it's an interesting product, but... For $299, it falls a bit short. Here's my take:
  • First, it's wide screen, but SD, 854 × 480.
  • Battery life is only 2½ hours. Yes, battery powered with ac adaptor.
  • LED light source, only 60 lumens.
  • Inputs? One, HDMI. HDMI input is via the same MHL port that the Roku Streaming Stick plugs into.
My suggestion? Use the Roku you have already, and buy a FAVI RioHD-LED-2 Mini Projector (LED, 400 lumens, $179 @ Amazon) or a Digital Galaxy DG-737 (150 watt bulb, >1000 lumens, $209 @ Amazon). Both have better specs and support a multitude of inputs, including HDMI. Truck on down to your local thrift store or cruise Craig's List and garage sales or even Grandpa's attic for a real projection screen instead of an old bed sheet. Your total cost, assuming you have a Roku already, is under $200.