Another issue that I ran into while trying to configure the integration is when trying to add the "SQL Reporting Services" web part I encountered an error along the lines that it wasn't added to the safe controls in the web.config. I looked at the safe control entries and the previous control was registered the version was something like 9.0.262.0 however the new dlls are all 10.0.0.0 so I added the following to the web.config and got rid of the old entries.
safecontrol assembly="Microsoft.ReportingServices.SharePoint.UI.ServerPages, Version=10.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" namespace="Microsoft.ReportingServices.SharePoint.UI" typename="*" safe="True"
safecontrol assembly="Microsoft.ReportingServices.SharePoint.UI.WebParts, Version=10.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" namespace="Microsoft.ReportingServices.SharePoint.UI.WebParts" typename="*" safe="True"
Trying to add the web part to the Report Center again throws another error about a verb not added to the web.config. This time the error message actually tells me what to add. So now I add the following:
add type="Microsoft.ReportingServices.SharePoint.UI.WebParts.WebPartHttpHandler, Microsoft.ReportingServices.SharePoint.UI.WebParts, Version=10.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" path="Reserved.ReportViewerWebPart.axd" verb="*"
And finally try adding the web part again and finally the web part gets added without errors.
I will say that the integration with SharePoint is a lot easier than it was with SQL Server 2005 Reporting Services but it still has some issues.