I realised that, in my limited exposure to the new components ( which are a very clever combination of portal page automation - creating new pages and adding components via a very nice GUI - and Lotus WCM content and resource libraries ), I'd done everything as the wpsadmin ID, which isn't particularly useful outside of my own Ubuntu-based demonstration environment.
Therefore, I dug into things a little bit more, and wrote up the following: -
In order to meet the requirement of a non-admin user creating/editing blogs, you'd need to add the required additional users/groups to the Editor role of the WCM library that forms the basis of the blog itself.
As an example, I created a new page called My Blogs, and then used the Blog Template library to create a blogging site called Blog-o-matic ( I did this via the Edit Page -> Customise -> Add Blog Library dialogue, as the portal administrator - wpsadmin ).
This allowed me to create blogs within the library, and add posts and comments. Other users could see the page/blog library/blogs/comments, but weren't able to create their own blogs etc.
Therefore, as wpsadmin, I navigated to the Administration page, and selected Portal Content -> Web Content Libraries and then clicked the Set Permissions button. From the Resource Permissions page, I then hit the Edit Role button for the Editor role and, in my case, added the "group" All Authenticated Portal Users to that role.
This means that any portal user can now log in, access the My Blogs page, create a new blog, view and comment upon other people's blogs etc.
Depending upon your requirements, you may want to restrict the usage of certain blogs to certain user groups ( in LDAP ) rather than using All Authenticated Portal Users.
And it looks sweet ..
And here's a screenshot, by popular demand :-