El Dorado

Trevor, it seems that by default, any user can post a blog entry. Is there a quick way to say only users A, B and C can post blog articles?

The trick is to use the "Admin-only create actions" option in the admin interface (/admin on your site). If you put "articles" in there, then only admins would be able to create new articles. If you put "articles headers" then that would apply to both the blog and the headers. If you're not interested in using a particular section (e.g. headers) then you can also hide the tab very easily with a theme. Here's an example that hides the blog tab and makes a custom login background:

http://newathens.org/themes/newathens.css

oh man, i love it! works like a champ.

lets say i want 3 or 4 users to be able to post blog articles..could i use that admin field to grant privs to them?

Given the way things work now, there's no "user roles" or a very robust permissions system to speak of. So, you'd have to use that setting, and then make anyone you wanted to have the ability to blog into a admin. You can do that from their user page (e.g. /users/1). Of course, this isn't ideal, but I'm hoping it's good enough for the time being.