The following are the 3 ways that I know and would like to know the experiences from SO users.
URL-based
Report Viewer Control from Visual Studio
Web Services
The following are the 3 ways that I know and would like to know the experiences from SO users.
URL-based
Report Viewer Control from Visual Studio
Web Services
Not sure what you're using as a report generator on the server side, but I've found that serving up reports in PDF format is a relatively pain-free, cross-platform way to go. Almost everybody has Adobe Reader installed.
Update: sorry, I missed the SSRS tags, but you can output SSRS reports to PDF:
http://www.codeproject.com/KB/reporting-services/PDFUsingSQLRepServices.aspx
I still recommend PDF for the delivered report format. Cross-browser and near-universal, two things that make me (and clients) very happy.