It would be great to have an option to add a Flickr gallery to a website (continuing with the AppSumo thread). Flickr provides very few customization options, and for photographers, it would be very useful. For example (I don’t want this to be considered spam, just for you to see an example of real use): https://www.petaqui.com
I use a Flickr plugin for Wordpress to create the gallery (scroll down to see it). It’s a simple gallery, with small text at the bottom, and I can customize it from the panel to display only the latest images, or only those with X favorites, the most viewed, etc… If you offer options to customize colors, spacing, width, etc… it would be a great feature for photographers, as what I see, many photographers now use Flickr for portfolio, and have to upload the photos again on their website. With your help, it would be much simpler and the content would update automatically. It would also be interesting for albums.
Other options to consider (way less public as Flickr is HUGE): Glass.photo