I'm currently in the process of developing a site that I though may be a candidate for a multisite configuration, but I'm not certain. Basically I will ultimately be creating a number of subsites based on geographic location (something in the realm of how craigslist does it). There will potentially be quite a few nodes. Since individuals will come to the site to view info specific to a location, I though for the sake of database size, it might make sense to split it up. I guise to cut to the chase, I'm wondering what the advantages are based on my critera. I also wonder about the following things.
shared users: if the users table is shared, can users stay logged in as they move from one multisite to another?
shared content: there is a tertiary cck type that I would like to share across both sites, does this complicate things?
references: is there a way to reference a node on another multisite (other than making astatic link)?
updates: will the standard method of updating the database still function with a multisite configuration?
Thanks in advance for any info