[nixsee]

Some initial thoughts:

Overall, I'm very pleased with this so far! But, of course, there are kinks to be ironed out.

I would really love if it was more efficient to create highlights. In most applications that support highlights/annotations, when you highlight a section of text there is a popup with annotation options - highlight color, add note, etc...

The workflow is typically:
1. Highlight
2. Click desired action in the popup
3. If note selected, enter. If not (e.g. Highlight), you're already done.
4. Click away and carry on.

Conversely, in Calibre the workflow is:
1. highlight
2. right click for menu
3. click Highlight at the top left
4. click the pencil in bottom right
5. enter note
6. click checkmark or click away
7. click check mark in top right to finish editing

As excited as I am to get this feature in Calibre and be able to ditch my other reader programs (Kindle, Book Bazaar Reader), its cumbersome enough that I just wouldn't use it.

Another minor quibble: the highlight colors are not particularly pleasing. I don't have any better suggestions, but all I can describe them as is "pale and random". A more vibrant and harmonious color palette would be nice.

A final couple quibbles regarding the Browse All Highlights feature for the entire library. I really like this, especially with the search. But
1. Pressing "Esc" closes the window, whereas in the main Calibre window it clears the search. Not sure if something can be changed so that we can clear the search with Esc.
2. The restrict to Types and User dropdown boxes don't seem to do anything.