While some spam (like the Cialis ads) is obvious, other spam is cleverly disguised as useful information.
Even other times, spam is "accidentally" posted, where the user is just enthusiastic about a site or product and doesn't realize it's actually spam.
Here are my feelings about spam:
1) If you register an account here just to post advertisements for (or rave about) other sites, it is probably spam. I will give more leeway if you are a regular or semi-regular poster here, and just want to mention another site (even if it's competing).
2) Your post has to be something the community would find interesting or informative. If it's just a blatant advertisement, it is spam.
3) If you're posting about a competing site (basically any forum about poker), you are welcome to do so, but there has to be a reason for it. For example, if a competing radio show has an interesting guest on at the moment, you are welcome to post about it. If you are registering an account just to promote how "great" another show is, then that's not okay.
If there is any confusion as to whether or not a post would be considered spam, please PM me and I will clarify it for you. If I have already given you permission to post something, you don't have to ask again.