Amazon has released Send to Kindle for Mac 1.0, which enables you to transfer documents and images to your Kindle reader or Kindle app on your iPad, iPhone, or iPod touch. The Send to Kindle app offers three ways to transfer files: drag-and-drop onto the app’s Dock icon or main window; select one or more files in the Finder and choose Services > Send to Kindle from the contextual menu; or choose the Send to Kindle virtual printer when printing from any Mac app to send a PDF. You can send only a limited selection of file types, including PDF, Microsoft Word (.doc and .docx), text documents (.txt and .rtf), and the usual grab bag of image files (for a complete rundown, see this Amazon help page). Additionally, Adam Engst notes that it quietly supports Mobipocket ebook files as well (see “How to Download EPUB, PDF, and Mobipocket to the Kindle Fire,” 22 April 2012), but EPUB is not supported at all. Document files are sent to your Kindle or Kindle app over Wi-Fi, though you can choose to use Amazon’s Whispernet service for a fee of $0.15 per megabyte within the United States ($0.99 per megabyte when traveling internationally). The Send to Kindle app is also available in a Windows version. (Free, 8.1 MB)
ChronoSync Secret Menubar Shortcut
For a quick way to run a ChronoSync document without opening it, use the ChronoSync menu in the menubar. Select "Show ChronoSync menu in menubar" in ChronoSync's General Preferences window to activate the menu bar menu. Once activated, you'll see the ChronoSync circling arrows icon in the menu bar, at the top right of your screen.
You can open any scheduled ChronoSync document directly from the menu bar. If you hold down the Option key while selecting a ChronoSync document, the synchronization will run immediately without the ChronoSync document opening.
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Once the pair are installed, open the Previewer app and just drag'n'drop your EPUB file onto the Previewer window - the converted mobi file pops out automatically. The conversion is trivially easy once it's set up the first time.
And it's not necessary - if you read my referenced article above, it's easy to get and install an EPUB reader that's better than the Kindle app.
The main downside is that you end up with books in multiple locations, based on format.
You could also say "convert them yourself" about Word or RTF docs. And, yes, I know there are other ways to get ePubs to a Kindle – I'm just pointing out a glaring omission in this utility.
In any event, what Send to Kindle appears to do is convert documents to PDF and then send them to your device, so you're not exactly transferring source documents.