A blogger’s RSS reader should be directly integrated with their tools for writing posts. Anything you read should have a “Reply” button on it that can instantly generate a properly formatted blog post. That formatting should link to the original and either show a quote or put something meaninful in the link text. The cursor should be left in an edit field ready for blog writing.
WordPress should come with a feed reader.
The feed reader should be linked to an auto-generated blogroll. Anything the blogger subscribes to should be in the blogroll by default, with the option to hide links.