BubbleComment is a free video tool that let's you comment on any web page. No registration, and I use about 50+ times a day to send messages to family, friends, and clients.

Disclaimer: I am involved with marketing this product, but since it's a free cool tool, I thought I'd share the icon I built with others. If this is too much of a 'plug' feel free to remove my post/this image anytime. I love this service, and don't want to abuse my privileges.