Simple database reporting tool?

I have non-technical users who want to create their own reports (accountants, managers, etc.). I don’t know Crystal Reports, but based on what I can tell it requires that you know a fair amount about how your database is structured and how to build queries.

Is there a reporting tool out there that will let business users easily create their own reports?

Maybe something that I can set up initially for them that shows data at a more abstract level, or something that runs on top of Crystal Reports?