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)
Turn Off Filename Extension Warning
In Leopard, Apple fixed an annoying aspect of working with the Finder in Tiger. Previously, if you changed a file's extension, the Finder prompted for confirmation. But since no one has ever accidentally changed a filename extension, Apple thankfully added an option to turn that warning off in the Leopard Finder's preferences. Choose Finder > Preferences, and in the Advanced screen, deselect Show Warning Before Changing an Extension.
Send to Kindle for Mac 1.0
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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.