I have been using Instapaper for about a year and I like it.
Instapaper is a perfect aggregator for anything I want send to it; articles, blog posts, webpages, etc. It is all about putting everything that I want to eventually read in one spot to read later (in my living room on my iPad while resting or quickly on my iPhone while waiting in line at the DMV).
Instapaper is supported by over 150 other iPhone and iPad apps! You can even send an email to your Instapaper account to save and read later.
This week Starbucks is giving this app away for free, all you need to do is drop in and pick up a Pick of the Week card. If you do not live near a Starbucks drop me a message in the comments and I will send a handful of you a code (I grabbed a coupe extra cards).
I was going to more fully review the app but Appstorm did a great review on the top three read it later apps that you should check out. If you want to know how to use Instapaper take 4 minutes and watch this review/tutorial.