YAHOO! Pipes
I have nothing against Duffbert - really! I think he's a stand-up guy. I appreciate his interest in doing book reviews but I really only want his posts on everything else. To make it possible I created my very first YAHOO! Pipe. It's so very cool it's almost indescribable. What I did was to add a feed component with the URL of Duffbert's main feed, added a filter component to block all items where the title contains "Book Review" (the filter component understands that it is filtering a RSS feed and gives me the fields from the feed to filter by) and pipe that to the output (see below). Simple and effective.
Once the pipe had been created I simply subscribed to that feed instead. What's really cool is that if I would rather have a JASON feed to include in the web-page I simply have Pipes change the output format for me! Sweet!
If you haven't looked at YAHOO! Pipes yet you really owe it to yourself to do it.
Re: YAHOO! Pipes
I was able to implement exactly what you have described, then added the feed to my google reader.
I've actually created 2 feeds, one for just book reviews and one with no book reviews.
I think that the actual implementation is a little goofy and overly graphical which added un-needed complexity, but the idea is awsome, I can't wait for someone else to implement it better. Im sure some people upon being presented with the editing screen would be look at it as a puzzle to be explored, I didn't.
@Duffbert, evil is bad. I'd drop your feed.