I would check over the Rules & Regulations, because I'm pretty sure that we're not allowed to advertise a site with a post or thread, but we can put links in our signatures. Good for you for asking, though!
Yep, I was just checking up on it, here's what the Rules & Regulations say:
What about promoting my site on MiceChat? While we appreciate the idea of getting the latest news from the community, we ask that you refrain from posts that only promote another website. However, feel free to put a link in your signature, or use the homepage option in your profile. Discussions about specific articles/news from another website may be moved to the Community Outpost forum.
Thanks Angel for posting the actual rule regarding this!!
While it is not a Disney specific forum, we prefer that other sites that have forum boards similar to ours are not openly advertised to other members. As a warning.... members have been banned for attempting to promote other Disney sites with message boards.