Russell Beattie's post on Turning A Blogger Off made me think and suggest an alternative solution in a comment to the post.  I have reproduced it here for wider distribution.  I have no feelings one way or another about the ranty part of his post, but I can't resist solving a good problem.

<hat type="Zen master">
    Ignoring takes energy.
</hat>

<hat type="engineer">
    Best solution is to filter out unwanted posts from RSS feeds. News aggregators with filters should be able to hide posts with unwanted content. One should be able to provide filtering hint to the aggregator with a single click that say:

• "don't show me posts like this from this blogger" or
• "don't show me posts linked to this post."
• "don't show me posts with these words."

First hint can be processed by a Bayesian filter.    This filter should also be able to filter out spams.  Second one is just a simple link filter.  Third is a general string or regular expression filter.
</hat>

<hat type="Zen master">
    We all have good sides and bad sides like a stick of chocolate/vanila twirl icecream. Eat carefully instead of throwing it in the trash entirely.
</hat>

Update #1: Filtering RSS feeds is a relatively simle and not very interesting technology wise.  The interesting part is what can be done with the hint.  Leaving out the nightmarish use-cases, using them as feedback to the author could be useful.  Feedback aggregation can be done using services similar to "Dave"'s excellent subsHarmonizer.

Update #2: The filters should also be applied to comments so hint like "filter exchanges by these two bloggers" will work on comments as well.