ACK… noooo…
SITE should be BLOG… not only does SPF have multiple blogs, but can also host multiple SITES…
example:
- planetgreencentral.com = SITE #1 & Blog #1
- affiliates.planetgreencentral.com = site #1 & Blog #2
- evbid.com = Site #2 & blog #3
- lovemom.evbid.com = site #2 & blog #6
Although Blogs always increment according to when they were created relative to all other blogs, Sites do not.
you can create blogs as subdomains or sub folders of any site available, and sites can be added after blogs have already been created.
A single installation of WPMU can host hundreds of sites, each with hundreds of blogs, without any increase in file storage.