Microsoft Charting Component was released just over a year ago for .Net (ASP and WinForms), and is based on a cut down version of Dundas Charts API, from whom Microsoft have purchased the IP. The download, with a very good sample gallery, is avialable here. Having looked at all the examples, theyre not as smooth or interactive as the native Flex charts, but good enough all the same.
ASP.Net dashboard example and tutorial is available on Michael Ceranskis site.
According to Alex Gorevs blog, the charting components will be integrated into .Net 4 (he also has some good tutorials).