Thanks Ozark for the mention, glad you're enjoying RVillage. :)
Bill - Journeyer is correct. You cannot see membership numbers without joining up. I believe they did this for privacy reasons, RVillage has a feature which is a map of where everyone who's made their location public is currently staying. This tool allows members to find other people with similar interests staying in their campground or nearby locations. I don't know about you, but I really wouldn't want spam bots and such being able to see my location, making it a sign up first thing keeps these information farmers off the site.
The forums aren't all encompassing like here on RVnet. Members can make and join interest groups, and those interest groups each can have their own forum. So for instance, there's a full-time RVers group on RVillage which you can join, and that group has it's own forum which is for discussing, surprise, full-time RVing.
It may not be for everyone, but I really like how RVillage is combining a traditional online RVing community with the ability to locate and meet up with other RVers who are nearby you for in person meetings. It's still young and it's hard to say how it'll pan out, but as a solo full-timer who is introverted and has a hard time introducing myself to strangers, this site holds a lot of potential for me. Like Journeyer, I am not affiliate with RVillage in anyway, I'm just a member who has enjoyed it so far.