...for when you miss a few days of stories? The ability to find all articles posted by date is very lacking, well, let's be honest, it's pretty much completely lacking, and in order to find what you need you have to go back and back and back —- it is so inefficient.
There was a wonderful service I used called Feed My Inbox which perfectly converted the io9 RSS feed into a daily digest and sent it to my email. Unfortunately it became defunct and now I use one called blogtrottr but it is not as good. It skips over big chunks of material every day and pisses me off. I am going to try RSS FWD and see how that works.