Your plugin rocks. Just ran the first test using 1.1. Only two Calibre-managed books didn't go into collections. My usual "problem files" processed fine. (The Kindle dictionaries and Active Content files aren't managed by Calibre so for this test they don't count.) Yay!
Affected books were _The Beautiful and Damned_ and _Against the Tide_. TB&D came from MobileRead and AtT came from Baen, so not sure what the issue is. I will look into it some more, and also run a few more tests using special characters and see what happens. I just wanted to post this to let you know that this is working amazingly well for me.
Test details: Used user column ("collect")to create 6 collections; over 500 books. Awesomeness happened.