The other day I saw this link to an article about query mistakes. It's got some pretty good information in it, so I thought I'd pass it along.
The Biggest Mistakes Writers Make When Querying Literary Agents
Over the course of my querying, I've made several of these, but not in a long time. Here's hoping I'm not making them unconsciously. And here's to never making them again.
If you're out there in the query trenches, good luck to you. I'll be jumping back into the foxhole shortly.