The new settings block is the correct way to implement all the blog settings.
Implement external blog PULL system
Did you delete this blog_externals block?
I still find a table named blog_externals in my Moodle 2.0 database. Should I delete this? The problem is that I get a warning in my Moodle4Mac 2.0 when I update it via cvs. On the page Plugins Check it's the last entry in the Block section.
? blog_externals Non-standard (Missing from disk)