Magma is a new site that isn’t open to the public yet, but is worth signing-up for to get an invitation.

Among other things, it shows you a continually updated listing of the most viewed videos on YouTube, Stumbleupon, Twitter, Delicious and a bunch more sites. In addition, you can collect your own lists of the ones you want to save.

I’m adding the site to the earlier post where I share how to find the most popular online videos.