While viewing a published landing page with a form, you can open it up directly in Marketo with this little tool.
Note: This tool is not officially supported.
1. To install, go to http://www.marketo.com/tools/.
2. Drag Open LP -> MKTO onto your browser bookmarks bar.
Tip: To show the browser bookmarks bar:
3. That's it. Just click the Open LP -> MKTO bookmark when viewing a published landing page with a form.