If you use Google Reader and Instapaper, then you want to make sure you pay attention to this post here. Using some of the new features introduced over at Greader this week, it permits you to add articles to your Instapaper queue straight from inside your feed reader. It’s very slick.
The only shortcomings I see at the moment are the blank 201 result page and the lack of fine tuning what URL gets sent over. I like to choose a print view before adding an item to Instapaper, but perhaps saving a few clicks may be a worthwhile tradeoff.