I've used blog explosion for years and found it a good way to get blog visitors and is also has some useful tools like their pinging service.
I've even recently invited some friends to join, but found out new member sign ups have been locked. So I went to the forums and I find out there is a huge backlog of blogs to be approved and the owners are being unresponsive to other staff who are asking to be put on the approval team.
And it gets worse, apparently the owners seem happy to let this carry on the way it's going as long as they make money from the Ad's!
So blog explosion members if you are concerned about this I urge you to go to the members forums and join if you haven't yet, if you are a member please go to this topic Pigging BE as a cash cow? and When will new sign ups be enabled again? to register your disgust with the state of affairs.