Here is a great article. I am only providing part of the article because it is very long, but it is well worth the read.
Cerulean Sanctum » Who Watches the Watchers?: "But a couple live blogs I deleted outright. I killed even more of their kindred in my Bloglines setup. The common factor in those links and blogs that I will no longer read is that they were mostly heretic-hunting blogs.
Old timers here know that I've discussed the Godblogosphere's explosion of heretic hunters and taken a middle-of-the-road approach: We need to root out heresy, but we also need to do it soberly and with care.
But I've seen enough. The following are the reasons why I will no longer support those sites:
1. They're not confronting soberly and with care.
2. They're using dubious logic and questionable facts to assail their targets.
3. They disingenuously look the other way when their favorite sources violate their standards.
4. They often ignore the whole counsel of Scripture.
5. They operate in the same manner as the targets they criticize.
6. They overlook their own issues.
7. They utterly refuse correction when they're clearly wrong."