[thristian]

This is a fundamental problem with RSS/Atom based aggregation: people write their blog posts to work nicely with their own site's CSS, and then when the post is aggregated onto a different site with a different theme it can look very different. Some blogging engines try to avoid this by deliberately stripping out anything but basic HTML from the RSS version of a post, but that can create the same problem in the opposite direction.

In practice it's not a big deal, though. Most posts use pretty simple markup, and of the ones that don't, if you read a Planet regularly you learn pretty quickly whose posts are worth clicking through to the original site to read.