Hotaru-san (Mr. Firefly) is a fun web program that lets you send short messages to people in a slightly e-cardish way, except it’s much more fun. The start screen shows a gymnasium full of people dressed in black full-body tights with giant light bulbs on their bums; they’re supposed to be fireflies. When you type a message into the boxes at the top of the screen and press start, the firefly guys will get up, rearrange themselves, and spell out your message with their butt lights. Once you’ve created a custom message, you can send it to people by email. Cute idea! It’s an ad campaign for web provider So-Net.
Link (Thanks, Kazuyoshi!)