Well, I like some of the new 2.0 features but the problem of one bad ebook (corrupted format or whatever) causing the entire KT to crash still exists, and I think the Kobo folks still need to equip the desktop app with a quality (integrity) check to filter out bad ePubs before they get near our little gadgets.
Last night, in installing 2.0, I first removed the SDHC card with the 1 to 4 bad books referred to above in post #1.
Before reinserting the card, I deleted the 4 books (via Windows Explorer as I couldn't do it with Calibre if KT wouldn't finish loading my library).
Then I inserted the card and prayed. And I guess the KT would still be Processing Content till kingdom come. So now I have to reformat the card and begin the tedious process of sideloading hundreds of ePubs a couple dozen at a time either in main memory or onto the card.

? or am I doomed to spend time in tech-hassle hell tonight rather than reading a newly purchased ebook (Rebecca Stott's Darwin's Ghosts) in bed?