Themes for Multisite?

One question I had with Multi-site is about the Themes. Can each site have its own Theme or do they all share the same one?

Yes, they can all have there own theme.

Right now we actually have a Theme that has a ‘members’ sign in area. If we used Multi-site could we have three separate sites with separate ‘Members’ sign in areas?

Yes you could but users that register at the main site, have pseudo-subscriber access to all the other sites in the network.

I say pseudo, because they won’t be listed as subscribers on the other sites, but they *will* be able to comment while logged in if any site has the “must be logged in to comment” box checked.

to manage the pseudo subscriber issue u could use a plugin called user editor role or adminize (if i spelled it write) ??