Well I've been to the Bluebird Cafe open mic night four or possibly five times now. I've played twice. That's because the line is always long.
I was there a couple weeks ago and the line is much longer than it used to be. Actually it's not longer -- now it's sort of a square, there are lines next to lines. The local businesses got tired of the line blocking their front doors.
They've also added a guard that organizes things. All of this is due, I hear, to the prominence of the Bluebird Cafe in a TV show that I have yet to see (which, legend has it, is NOT filmed at the actual Bluebird Cafe but in a life-sized replica -- step back from that for a second and think about the interesting world we live in -- imagine explaining it to your great great great grandmother).