I'd like to put up a WP feature request -
A checkbox "Show on front-page" (enabled by default) in the Write post Advanced editing section. Basically it does what it says. If checked, the current post will show up on the front page. If not, only when viewing posts under the current posts categories.
Some posts are just not important enough and/or this could be useful in blogs with multiple authors (of which some are not important enough ;) ).