Here’s a bookmarklet for saving a webpage to your Instapaper account from your web browser. Unlike the standard Instapaper bookmarklet it doesn’t require you to already be logged in to Instapaper or have cookies enabled in the browser.Save to Instapaper <-- Drag this to your bookmarks bar.
When it works you’ll see a page with a bookmark_id (9 digits) as proof of success. You’ll now have to click your browser’s back button to return to the page you were on. If it fails you’ll see an error number (3 digits, eg. 403 means invalid username or password).