It's come to my attention recently that analogies are considered logical fallacies. I was looking for a bit more information on the subject - all analogies? Some analogies? Is there a Latin term for it? - and came across The Fallacy Files instead.
According to the site, only weak analogies are logical fallacies. This wasn't really the answer I was hoping for, at least not without a reliable way to determine whether a given analogy is strong or weak.
I've decided to err on the side of caution. I'm not going to use analogies at all, at least for a while. I suspect they have no real place in logical discussion - as a literary tool, ok, or a teaching tool, but not to lever an argument in one direction or another.
And in the meanwhile, click through this link for a nifty diagram of logical fallacies, with lots of nifty, colorful names - like the Tu Quoque (so little known that it's certain to derail an argument, if cited), or the Hot Hand Fallacy (with a name like that, doesn't it deserve a test drive?).