I've tried Orbit and it works well. With one click it'll download every single thing on the page, if you want. I think I got it from download.com.
I'm not sure if it'll do Flickr. They have them set up where you can't download them, due to copyright. If I find something I really like on Flickr, I do a print screen, paste in paint, resize and save. Yeah, it's a lot of steps, but it's the only way I've been able to grab photos off Flickr if they don't have them listed as downloadable.