Persistent.info shows a cool trick combining Google Blog Search with Reader to filter feeds’ contents (via this thread; dunno how to link to the exact post, if that’s even possible). I used this successfully to screen out all other posts except image collections from Fishki.net‘s and Webpark‘s feeds. Here’s the search for Fishki.net and the search for Webpark; these should work as long as they won’t change those titles.
Good Noodles.