A simple widget for displaying the most recent public images from a SmugMug account.
You can find the official development page here.
At the bottom of your SmugMug login page, you should see a link named Available Feeds. Click that link and select the RSS feed for Recent Photos.
One common reason you may not see any photos is that this widget only works with publicly accessible photos on SmugMug. If your albums are private, this widget will not be able to retrieve them.