The most obvious features are a check-to-save tool that adds the add-on’s signature checkmarks to Google Reader items, as well as an option to use the pageview-counting PostRank service to rank your to-read items. Those using non-Firefox browsers can now get an account and bookmarklets from the Read It Later List site, and enable an option in the Firefox add-on to have everything you mark for later reading saved as an offline copy. Wondering what all the fuss is about a seemingly simple bookmark tool? Check out Gina’s screenshot tour of the award-winning add-on. Read It Later is a free download and works wherever Firefox does.
Read It Later also allows you to save the articles/posts for offline reading easily. This added functionality to Google Reader makes it a heavyweight champ. I recommend it.