The Plus UPIC-64M Wireless Interactive Panel is three presentation tools in one.
First, it's a 64-inch interactive whiteboard with a 4:3 aspect ratio on which you can "draw" with an electronic Bluetooth-enabled digital pen. Second, you can use it as a conventional whiteboard (with the included special markers and eraser to protect the panel's surface). Lastly it can be used as projection screen without the "hotspot" in the middle that plagues regular whiteboards.
If you present on the go you'll appreciate its ultra-portable roll-up design and its included carrying case that holds the screen and all of its accessories. At your destination just place the magnetic panel on any metal surface such as a whiteboard or greenboard. The panel itself requires no power and the digital pen uses only a single AAA battery.
The only tools you'll have to provide are a Windows laptop on which to run the UPIC software, a projector and a cable to connect the two—tools you probably already have.
The digital pen communicates with the PC over Bluetooth. The included UPIC software converts the motion of the digital pen over the panel and sends it to the projector so fast (it scans 50 times per second) that it looks like you're writing right on the panel. You can even save your annotated presentation as a new image file.
Oh and don't worry if your PC doesn't have Bluetooth built-in. A USB Bluetooth dongle is included in the kit.