I’ve been a big fan of ThingLink, which lets students easily annotate photos, lets educators use the service for free, and allows you to create virtual classrooms. It’s on The Best Online Tools For Using Photos In Lessons list.

They’ve now just announced ThingLink for Video, which lets you annotate…videos.

It’s not entirely open to the public yet — you have to sign-up, but they say they’ll send out invitations a couple of days following a request.

I just registered, so haven’t had a chance to try it out myself. So I can’t say how it compares with other free tools that let you create these kinds of interactive videos. Those other tools include HapYak, WireWax, and The Mad Video.

Those tools are on A Potpourri Of The Best & Most Useful Video Sites list, and I’ll be adding ThingLink there, too.

By the way, the Adventures With Technology blog has a good example of how to use this type of tool as a language-learning activity.

Here’s a video describing ThingLink’s new video service: