I get that question infrequently, it is a good question though. And the strict answer is no, there is no Visual Studio F# Express. Now the BUT!
There is no Visual Studio F# Express, BUT you can make a type of Visual Studio F# Express yourself, and generally it is faster than using Visual Studio C# Express. You use the VS2010 Integrated Shell and then install the F# CTP. However, if you already have VS Pro or VS Ultimate on your machine then you won’t see it, the integrated shell will integrate itself into the existing VS Pro or VS Ultimate.
F# Samples: http://bit.ly/fsharpsamples , which includes 3D visualization and 2D visualization
Here is an example of the 3D visualization.