There are many image and file sharing online services available, but the one which stands out is the one which has the most simplest of interfaces and easy to share options. Min.us is a simple file and image sharing service with the simplest of UI and best of sharing options. The website has a drag and drop interface by which you can simply drag files on to the interface from the browser and it is automatically uploaded. You can also create an account or share the file without creating an account.
If you have multiple folders, you can create a gallery of photos and then share the gallery with your friends. You can share music, PDFs, and text documents along with images using this service. Here is a sample gallery showing how it displays file.
You can set the galleries or files to be private or public and also delete them any time you want. The maximum file size is 50MB which is fairly good enough for a file sharing service. The service also has desktop and mobile tools for sharing files, supported platforms can be found from here.
Min.us is featured file sharing service and probably the best feature is its interface itself.