Google Chromecast. Stream videos via Wi-fi from phone, tablet, or laptop by plugging this dongle into any HDTV port. Only $35. NEED THIS LIKE YESTERDAY! I may be behind, but it looks like this was just released in July! I know you could always use different cords to play things from a laptop to TV in the past, but this wireless! And so cheap!!!!
A cube laser virtual keyboard allows you to type on any surface. Battery lasts 150 hours and it fits in the palm of your hand. Even has 'clicking' sounds when you type. How crazy is that? Available from ThinkGeek for $169.