I've been relying on Google to email me when a comment needs to be moderated. Apparently this process is not infallible, and I need to check comments folders in Blogger periodically to make sure I haven't missed anyone. If you have posted a comment and you haven't seen it approved in a reasonable time, you can email me. The address is listed under "About" on this page.
I missed a comment from someone I admire and he felt slighted, which I feel badly about. I didn't want to go to moderation, but I don't know how else to keep out the spam. I value everyone's comments and appreciate the folks who take the time to leave one.