Read Later (for Instapaper) App for Android
'This app will allow you to "share" URLs to Instapaper.
The app will even let you post when you are offline!
If you are an Instapaper user this is the app for you! You simply select a link from e-mails or websites and choose the "share"/"share link" option. The "Share via" list will now contain the "Post to Instapaper" function. Sharing can even be done through the built-in browser menu.'
This is a free app