Charting and graphing libraries

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What are your favourite (free or commercial) .NET libraries for charting and
graphing in 2D and 3D?

--
Dr Jon D Harrop, Flying Frog Consultancy
OCaml for Scientists
http://www.ffconsultancy.com/products/ocaml_for_scientists/index.html?usenet
.

Follow-Ups:
- Re: Charting and graphing libraries
  - From: Rad [Visual C# MVP]
- Re: Charting and graphing libraries
  - From: Christopher Ireland
- Re: Charting and graphing libraries
  - From: Eric Moreau

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