I ran into an issue where a customer reported that she couldn’t find the Content Query web part (CQWP) in her list of Content Rollup web parts. After a bit of research, I found that the CQWP only appears if you have the SharePoint Server Publishing Infrastructure site collection feature activated.
Once I activated that, the web part appeared as it should. Noted here as I’m sure I’ll forget the next time this happens a year down the road…
SharePoint Duffbert 