I installed their shortcut into Firefox and now, whenever I see a lengthy article I would like to peruse later, I click Instapaper’s Read Later shortcut up in my menu bar. The article is saved and later I can visit the Instapaper website on my Kindle or use the Instapaper application on my iPhone to quickly access and read it. There is an option to show the article in text-only mode, which is useful for the Kindle.
The Instapaper website also has a Give me something to read link where interesting articles are collected – I found several of interest. But for me the richest mine for great articles has been the books article archive at Salon.com. I once was a paid premium member of that service, but gave it up because the gems were too few for the cost, but lately the service has been free and accessible. Another source of lengthy and interesting articles is The New Atlantis.
I still find the Kindle far preferable to the iPhone for this sort of thing, since it has a much bigger screen and the E ink technology is easier on the eyes. One simply has to scroll too much and too often on the iPhone when reading a long article.
So, if you have a Kindle or an iPhone or just need an easy way to save online articles for later viewing with your computer’s browser, I highly recommend Instapaper.