I use Reeder coupled with Instapaper: see something I want to salt away for offline reading, tuck it into Instapaper which caches it nicely.
InstapaperInstapaper also displays pieces in an "iBooks-like" way for easier reading with typographic control and more.
The nice thing about this combo (one could also use Read Later) is that Reeder lets you set up a simple button to do the salting away on its services panel. Very slick.