I had a 2-hour AMV block and it filled the small events room right up! The crowed loved it and I even got to play AMVs during the cosplay halftime and then an unscheduled block after that before closing ceremonies for about 1 hour!
I think this year I'll be doing a block of AMVs at 5 or 6 cons! Demand for such blocks and even dedicated rooms are on the rise!
Here are some pictures from that event
Here's me at the start complete with my dual shuttle computer setup

Here's the volunteer sound engineer (that's his real occupation too!) who did an awesome job of working the rented sound system for the AMVs shown. He's the same person resonsible for all of Animethon's Sound

The audiance's response after asking who knows about the org

And the audiance glued to the screen as the showing started

Not bad turnout for a small sized con indeed!
Vlad