Wouldn't it be a good idea to propose a portal page where one could have an overview of existing sites and access them? Currently, it's hard to see which sites are launched, which are in beta, and which topics are not yet adressed.
Most of this information is already available:
Latest and most progressed beta proposals here: http://area51.stackexchange.com/
Top voted content at the moment across the network, replete with a nice little "new site" alert for Philosophy: http://stackexchange.com/
List of active sites, full sites and betas. Betas have "beta" next to them: http://stackexchange.com/sites
I'm not sure whether consolidating all or parts of it would be useful; I think it probably works as is. The StackExchange home page I'm guessing is designed to help people new to StackExchange find interesting sites by highlighting interesting discussion, so it makes sense that the full list of graduated sites is one click away, i.e. if you're looking for something specific.
As for Area51, I think it's better that new users have to work to find that. This means they participate a little on the network first and get a sense for what a Stack* community is, before starting one/committing to something etc.