Google is showing a new type of display for forums in the SERPs, where they list a selection of forum posts related to your query. I think it's a great idea:
Google posted a video on their blog called "Privacy, Plain and Simple". I've embedded the video below so you can see it before reading my criticism of it:
This site gets a lot of traffic for bikini-related keywords like "brazilian bikini, "bikini photos", "bikini photo gallery", and even "how to do a brazilian". I've just started to get some Google traffic for "Heidi Klum" though I don't have any posts or photos of Heidi Klum. I also have another site that still comes up for porn-related queries, even after removing the "free porn" spam comments. Server logs can be funny...
I've noticed a couple of Google bugs lately: one with robots.txt and another with Google Images.