It’s pretty easy to send just aboutanything to your Kindle, but if you’re looking for an even more automated solution, Kindlebox does the job by linking a Dropbox folder to your Kindle and sending anything over automatically.
Once you authorize Kindlebox on both Dropbox and Amazon, you’ll have a new folder in your Dropbox Apps folder.
Put any PDF, MOBI, DOC, or other key in of Kindle friendly file in there, and Kindlebox will send it over to your Kindle automatically.
If you use both Dropbox and your Kindle a lot, this makes syncing the two up a lot easier.
Unfortunately, it’s possible for you to’t delete stuff directly from the Dropbox folder, but it’s possible for you to delete from your Kindle as normal.
Kindlebox