The AVerMedia Live Gamer Portable is an excellent way to capture a presenters laptop feed during a live demo or presentation.
It lets you record to an SD card or even straight to your laptop.
Learn more about the product: http://www.avermedia.com/gaming/product/game_capture/live_gamer_portable
Download RECentral: http://www.avermedia.com/gaming/download/live_gamer_portable