For the hungry world, here are a few Gmail screenshots, featuring conversation threading and collapsable cards.

Expanded:

Collapsed:

These are screenshots of an actual conversation between Jason and me, and shows an example of Related Pages. Related Pages aren't ads, they're just similar pages from within Google's web crawl. Nobody pays for them to be there.

Ads don't appear on every page. I'd guess they come up about once every 3 or 4 messages right now. Sometimes you get ads, sometimes related pages, sometimes both, sometimes none.

Often they're eerily relevant. A Related Pages link to BoingBoing came up twice in my mail today.

Anyhow, I'm sure more screenshots will appear on the web soon.