NDjango is an implementation of the Django Template Language on the .NET platform, written in F#. It has full django tag support, and most of the default filters. Also

Easily extend it by adding your own filters or tags, either using C# or F#
Plug-and-play NDjango with Bistro, ASP.MVC and |MonoRail
Use NDjango standalone, through the NDjango Library
We also did some load testing of NDjango as compared to other rendering engines with some pretty amazingresults
Starting with version 0.9.8.1 NDjango supports ASP.MVC3 (Preview 1)

Current version 0.9.8 ships with the NDjango designer - a Visual Studio editor extension for Django templates. The editor has:
* Syntax highlighting and error checking for NDjango tags and filters
* Code completion for
    * Strongly typed model objects
    * NDjango tags and tag attributes (including your own custom tags and filters)
    * NDjango filters
    * Block tags and templates (for the {% extends %} tag)
* Wizards for template creation

You can find complete info here

NDjango is now also available as a NuGet