I use Google Reader, but there are often images in the feed that I want to keep, but right-clicking each one is too much.
How can I permanently download the images from multiple RSS items (or the whole feed)?
I would recommend either the Save Images Add-On in Firefox, which can download multiple images from a page. Or you can use wget, which can mirror webpages. Neither of these things are optimized for rss feeds though, as far as I know.
I suggest you look at these two posts by James Bruce