StumbleUpon was a terrific time-waster. Click on the "Stumble" button and it would take you to a random web site according to your preferences. I found a bunch of terrific sites about Linux programming, music theory, adult comics, science fiction and more.

The owners recently shut down StumbleUpon and urged everyone to move to their new site, mix.com.

Which is a freaking disaster, if you ask me. I won't go into details. Instead, I wonder if anyone has found a site similar to StumbleUpon, and how you like it and why?