Don’t you love being beaten to the punch?
I just found an old document titled ’email instapaper idea’, from 12/13/10 whose body was:
“You get an e-mail address, when you send e-mails to it it parses the body looking for links. That link is then fed into Instapaper and later synced to your mobile device”
Fortunately Instapaper had the same idea I did and implemented it beautifully; I use this feature daily to send myself interesting articles via Twitter. If you haven’t discovered it yourself, go to http://www.instapaper.com/extras after registering.
Example #135235 that ideas are cheap. Implementation is what matters.