LOL, you sure out did yourself!

I laugh as I disable all the plugins and extra features. When I started to import the books, it was going blindingly fast. Now, about 40% in, it is going moderately fast. Hey, I finally found a program that uses more RAM then Firefox! Still getting about 10/min. Strange, no books have been copied yet.
OK, I finished reading the metadata - All the books are now being imported into Calibre's essentially proprietary directory structure.

(JK)
This is going to take a while...
So in the mean time, about those scripts... Damn windows - I want my man pages back! I have no idea how to do that. Ah, I found your documentation. Looks like the GUI is a far better way of doing things. Seriously - I nominate an I'm Feeling Lucky button as the best feature Calibre could add
So - I believe the line
librarything -u darkmonk -p passwd *
would fetch all the cover art?
Meanwhile, I have no idea how to do so with isbndb because it requires multiple variables. Care to give me a bone?
If not, I'll try to make a macro to do it with each - and just let it run for a while...