TypePad, my blogging service, recently made a change where a maximum of 50 comments per page are shown. If a post exceeds 50 comments you need to hit the Next link to see the next batch. So if it seems like your comment didn't show up, it may be that you just need to hit Next.
This also seems like a good time to remind everyone of the commenting policy. Until I get something better in place, I'm hoping those who read the comments can help out by dropping us a quick line if any inappropriate comments are made.