Instapaper iPhone application let you use a bookmarklet to flag articles that you'd like to read later, then gives you a web-based interface to go back and find those articles. The Instapaper iPhone app goes one further - it syncrhronizes offline copies of your saved articles so that you can read them even when you're not online.
Instapaper comes in both free and pro versions on the iPhone. The free version has met my needs perfectly so far, but I imagine if I was to go on a long flight, I would pony up the $10 for the full version, as the free version only synchronizes 10 or so articles at a time.
Download: Instapaper iPhone application (iTunes links)
Source:→ Download Squad