I recently moved by blog from kurt-anderson.com to kurt-anderson.com/main. The move was successful, but I changed my mind & tried to move it back to where it was originally by reversing the process. Problems ensued.

Now:
- it shows my blog, but it is unformatted
- if you click on any given entry, it still redirects to a /main permanent address
- if you try to access wp-admin, it redirects to a /main directory AND gives a 404 Error

I'm sure there is one simple solution that will resolve all of my problems, but I am unable to figure it out on my own.
Thanks in advance for all the help!

If you can access the WP database for your site you should be able to fix it.

The info about the site URL is in the wp_options table. If you can get there and edit you should be able to fix it.

Where is wp_options found? I don't see it in my main directory (that might be the problem). The only similar thing I could find is an Options in wp-admin
So I guess (a) where do I find my wp_options? (b) Once I find it (or download a new one) how should I edit it?

Forget that first idea. If you've got access to FTP then see this page:
http://codex.wordpress.org/Changing_The_Site_URL

Perfect! Thanks!