Read it Later is great
Read it Later is very nice for this, especially in combination with Reeder, which lets you assign a "send to Read it Later" gesture.
Read it Later is not a passive newspaper that preloads everything in the world to your iPad; it's a to-read list manager that preloads the items you've put on your to-read list. You must first go through your RSS reader and pick out the items you'll eventually want to read.