It looks like Pinterest hasn’t provided a convenient way of adding the Pin It bookmarklet to Safari on the iPad. But try the instructions below. Its been tested with iOS 5.

Step 1
Bookmark this page in Safari on the iPad. Give it a useful name like Pin It.

Step 2
Copy the javascript below:

javascript:void((function(){var%20e=document.createElement('script');e.
setAttribute('type','text/javascript');e.setAttribute('charset','UTF-8');e.setAttribute('src','http://assets.pinterest.com/js/pinmarklet.js?r='+Math.random()*99999999);document.body.appendChild(e)})());

Step 3
Go back and replace the bookmarklet address with the javascript above.

Step 4
Pin away!

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Tweet me if the Pin It bookmarklet no longer works.