Reporting, and dynamically creating PDFs from .NET
Here's a great piece of work off GotDotNet for dynamically generating PDF files with .NET. I can see this being very useful for reporting in ASP.NET. I'm consistantly amazed at the ammount and quality of useful code that the .NET Community creates.
Another great online resource is the Reporting Starter Kit at the Asp.NET site. It includes examples in C# for dynamic generation of charts and graphs in memory from ASP.NET and same very englightening DataBinding examples, including Master/Detail, and Drilldown.