Wow, thanks David. I didn't expect a response this quick. What a beautiful world I am living in.
Alas, I spoke too hastily. When I talked about AZW, I tested the setting with my PC web browser and not with my Kindle. When I finally did test it with my Kindle I found one more obstacle.
Kindle claims to have some basic support for JavaScript, but this isn’t the case with the scripts in calibre2opds-generated catalogue.
I just tested Dropbox+calibre2opds+Kindle2 with my 300-book-loaded calibre. The catalogue looked quite nice on the Kindle. However because Kindle's basic web browser can't process java-scripted download links, I couldn’t download anything. When I click on the link the page just reloads, nothing else.
It would be really nice to have some options to control availability of JavaScript in download link. Ex) when you set the option, download links are listed as text.
Maybe there is more elegant way to handle this; I don’t really know this kind of things. Please give it a thought.
And my thanks again.
PS. I forgot to mention that there are three known Kindle file extensions. TPZ is Amazon's Topaz format. AZW1 is another name for Topaz format, and of course, AZW.