Flames and rants are fine, as long as the flames don't get so bad that Slack Bastard Networks finds itself drug into the middle of a flame war or legal battle. Copyright violations are a strict 'no-no'. Always give credit where credit is due and use things with permission. Yes, we're aware of the satire laws. We love them, too.
Satire is perfectly acceptable.
Please, please, please be considerate. And remember to use thumbnails.