ASP.NET 2.0 will have native support for dynamic image generation.  This is often done today using an ASPX page and setting the content type and using a bit of GDI+ from the System.Drawing namespace.  In ASP.NET 2.0, there will be some new base classes that will make this much easier, and a new file extension dedicated to this type of content, *.asix.  Coupled with these features will be a new web control, the DynamicImage control, which will make it easy to place generated images on a page.  Images may be stored in memory or on disk using these features, and will support automatic detection of supported formats for mobile devices and can convert the image on-the-fly to a supported type if necessary.