What is a good templating engine?

What is a nice templating engine to use in C#? I have XML or JSON as structured datasource. This data needs to be presented to users on the web in strict XHTML.

I've been using XSLT mostly, but maybe there are more or better options?

It needs to be used in C# or Iro开发者_StackOverflownPython.

StringTemplate is great. I also like the Spark View Engine, which is primarily for ASP.NET MVC, but can be used on its own (the download includes a good example).

You could try Apache Velocity Engine http://velocity.apache.org/engine/index.html