Flickr's just been updated to include some features you probably wanted.
Among them are some basics—uploading is faster and it's easier to save pics from your Photostream to the camera roll. Then the app gets to some things you've probably missed. It now auto-saves your original photos before you add a filter. If you @ mention a contact in a comment or description, Flickr tags the person. If someone mentions you, you now get a notification.
Flickr has also bumped up the resolution of the lightbox display, so your images look better in that setting. And something it needed? The ability to take a picture with the iPhone's volume up button. We like Flickr. And now we like it a little more. [AppStore]