Readablepub downloads a cleaned-up copy of any online article and packages it for offline reading on many devices (as epub). Images are included, but scripts or stylesheets aren't.

We use Readability's Parser API, so you must sign up here.

Readlists offers a similar (and much more 2.0) service, but I enjoy saving myself clicks when possibile. Also, one could swap the Readability API with a Python implementation and self-host.

./readablepub.py --token=YOUR_READABILITY_PARSER_TOKEN_HERE http://wwww.coolarticles.com/latest_article

You can also save the token under ~/.readability_parser_token to avoid passing it in every time.