If you're not following New Leaf Literary & Media, Inc. in the blogosphere, You're missing out. They do this really helpful question and answer thing, where they invite people to ask questions about the industry. Their answers are awesome. Definitely worth a read through and, even though they sometimes fill up my blogroll with their posts, it's definitely a must-follow blog.
You never know when they might answer the question that's been on your mind. Like yesterday's questions of whether it's better to wait until February to query because of the holidays (and the post holiday query tsunami), and when you've got fulls out and one agent requests revisions, should you let the other agents know?
Go forth and stalk.
If you could ask an agent any one question, what would it be?