A few days ago I blogged about hosting ASP.NET 3.5 charting controls in a SharePoint Web Part, now there has also been a first beta release of a Silverlight variant.
Jan Tielens created a Charts Web Part which hosts Silverlight charts in a SharePoint Web Part. It makes use of Silverlight and the Visifire data visualization components. See his 3D Silverlight Charts in SharePoint: SmartTools.Charts blog post for more information or visit the SmartTools for SharePoint CodePlex website.
Silverlight List Chart inside a SharePoint Web Part