A collection of links and publications about SharePoint Reporting in General:

By Bill Simser, July 2005, general article about existing solutions
http://weblogs.asp.net/bsimser/archive/2005/07/05/417923.aspx

By Cory Burns, Tips and tricks, "SharePoint Reporting Methods", (developers)
http://blogs.technet.com/corybu/archive/2007/06/01/sharepoint-reporting-methods.aspx

From Code Plex, MSIT SharePoint Reporting Framework V2.1.0ex (developers)
http://www.codeplex.com/MSITSRF

From Mart Muller, Reporting over SharePoint lists with MS Reporting Services
http://blogs.tamtam.nl/mart/ReportingOverSharePointListsWithMSReportingServices.aspx

From Joel Oleson, SharePoint Reporting Solution (some solutions are mentioned)
http://blogs.msdn.com/joelo/archive/2007/09/28/sharepoint-reporting-solution.aspx

By Tim Heuer , Admin Report Kit for sharepoint
http://www.timheuer.com/blog/archive/2005/01/18/1639.aspx

CardioLog - from Intlock, a SharePoint Reporting and SharePoint Usage Reports solution, free version is coming on August 2008.