Software:The Image Collector
The Image Collector (referred to as TIC) is an application that has been designed to allow the quick viewing, categorisation, and downloading of images from a range of web services.
TIC allows you to choose the web service you would like to download from, fetches the latest available images and displays their thumbnails in a scrollable grid. You can then left-click an image to download and display its full version; if you want to keep that image, middle-click on it and it will be downloaded to the selected category.
Categories point to a location on disk, so you can activate a category and download an image, and it'll be automatically placed into that category's location. This, combined with queued downloading, allows images to be downloaded and categorised very quickly. There is no need to wait for images to complete downloading before viewing and downloading more.
More specialised plugins are available from The Image Collector's website, along with a portable zipped version of the application.