Are there any decent alternatives to Instapaper? Pocket is the obvious one, but doesn't have highlights (which I rely on).
It contains highlighting, send-to-Kindle, decent mobile apps, and all the other features you would usually rely on!
Feature-wise, no alternative compares to it.
The only problem: UI. It's not the UX (things are where you expect them to be), but UI just looks... wrong. The same thing applies to their website(s) as well.
Needs a jailbroken Kindle...
It lets you save complete articles and webpages to your email inbox. If it fails to extract useful text, EmailThis will save the page to a PDF and send it as an attachment.
There's no need to install additional apps on your phone or login to any 3rd party service.