BackType is a service that lets you find, follow and share comments from across the web. Whenever you fill out the "Website" or "URL" field in a comment form when you publish a comment on a blog or other website, BackType attributes it to you. We give comment authors a profile featuring all the comments they've written on the Internet.
Site lets teachers post a question online. Students then respond via webcam (no account required) and have their (moderated) comment added to a really great-looking video wall online. Site does cost $65 annually, but that includes 10 walls and virtually endless questions/responses.
Enter a problem, and a unique URL is created. Once shared with others, a group can collaborate by adding questions, comments, solutions, etc. Very easy to use and effective way to solve problems.
Browser button add-on that eliminates superfluous items from YouTube (ads, comments). Just install in the browser bookmark toolbar, browse to the desired video, and click the Quietube button.
Another tool that allows viewing of YouTube w/o ads or comments. Enter a video link, and Safeshare creates a new link to the video in a page w/o the distractions.