Amazon has released a new PC app that lets you send documents from your computer with a right-click in Windows Explorer. Just find the file you want to send and instead of emailing it to your special Kindle email address you can just choose Send to Kindle to fire up the Kindle software and choose the device you want to deliver the document to.
The Windows Explorer integration should support any document that Amazon can handle including TXT, HTML, DOC, and PDF files — but not EPUB.
You can also basically “print” to your Kindle using the app as well. The Send to Kindle app will show up as a printer on your PC, so any app with a print button can send a PDF file to your Kindle, Kindle Fire, or Kindle app for iOS. You can print web pages, documents, or other content this way.