If you've just joined the forums, made a post, and don't see it; don't worry. Your post has not been eaten. All users with less than 5 posts are subject to a moderation queue. This is to prevent spam postings.
95% of the queued posts get approved. The only ones I don't approve are duplicates (I'll approve one, but not any duplicates).
Of course, if you have any issues or questions, feel free to ask.