Need a simple database reporting tool

Hello,
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?
Thanks.
