personally like to save pictures locally to my system but selecting them one at a time to download was too much of a hassle, so i went looking for some better alternative. Since there is no offical application/software released by Flickr, Flickr enthusiasts have developed some excellent Flickr Photo downloading tools using the Flicker API. Managed to some solutions, here are my recommendations.
1. Flickr AutoDownloadr : is a small, freeware Windows application written using the Flickr API and AutoIt. Using it, you can pick any photos from Flickr - yours, your friends', random strangers' - and create a slideshow from them, which displays in a fullscreen window.
Download Link (Thanks Ben)
2. Downloadr : you can search, browse and batch download multiple Flickr pictures based on image tag (s), Flickr username, Groups Pools. (Thanks Amit , January )
Download Link
3. Flickrdown 2.41 : This is also an easy to use downloader, the only catch it requires Microsoft .NET 2.0
Download link
By they way do check out this nice collection of Flickr Tools