[unboggling]

Originally Posted by friktion

But I'm a stickler for Table of Contents and try to make sure I get one hopefully at least for my favourite books.

Thanks for your input, you've given me many new ideas - for instance, the color-coding for different quality books. I'm going to definitely use that one!

Regarding TOCs, I don't usually care that much about them. But I just read in the calibre blog recently the latest entry on format conversion, which discusses generating TOCs in MOBIs automatically. Here's the link: Calibre Blog - calibre tips and tricks. Quote from blog:

MOBI Table of Contents: For the specific case of converting to MOBI, the eighth option on the left menu is "MOBI output". For MOBI output calibre generates a Table of contents (TOC), which is inserted by default at the end of the ebook. When the "MOBI output" option is selected in the left menu you can choose "Do not add Table of Contents to book" if you do not want the TOC or choose "Put generated Table of Contents at start of book instead of end" if you want the TOC at the beginning of the book. The TOC calibre generates is hyperlinked to the chapters.

Edit: Regarding color for different quality of book formats, I rely on that quite a lot.