You might know Google owns YouTube, GMail, GChat, Google News, Google Docs and Google Reader, but the full privacy impact probably hasn't hit you until you look at the information from all those services condensed into one place, on this dashboard thing. Oh look, it's the last person you chatted with, the last person you emailed, the last video you watched, the last news search you ran, the last Google search, the last image search, the last video search, the last document you authored and maybe what you're buying your wife for Christmas.
Here are some of my recent searches, for example, and keep in mind this is just one small part of the dashboard, which in turn is one small part of what Google knows:
Insane. And yet, nothing I didn't know about, on some logical unemotional level. There's a Google video explaining everything above, and you can find your dossier here, but be warned: looking at it could change your life.
Here's the rest of mine, not including my main Google Apps email and Docs accounts, and heavily redacted (sorry) (click to enlarge):