If all you would like to do is add bookmarks straight to Pushpin, then just add the following bookmarklet to your iOS browser of choice.
If you prefer to be directed back to your browser to the page you were looking at when you clicked the bookmarklet, you will want to use the bookmarklet below.
For you iOS nerds out there, you'll be happy to know even deeper integration is possible. Here is the overview of everything you can do at the moment. Unfortunately, x-callback-url only works with Chrome and Safari right now. The next update will allow you to tell Pushpin to direct back to your app.
URL: pushpin:// Result: Opens Pushpin.
URL: pushpin://add Result: Opens Pushpin and opens the add bookmark screen. Parameters: (all are optional)
tags(separate with spaces)
unread(can be "yes" or "no")
private(can be "yes" or "no")