From the F# Team Blog:
If you're familiar with the site Try F#, which lets you run F# right in your browser, you'll be happy to hear that the Try F# team has launched Try F# 3.0 today! You will find updated content and tutorials, plus content that is tailored to particular areas--such as data science, numerical and scientific computing, and financial computing.
Aside from supporting all of the features of F# 3.0, Try F# 3.0 includes an enhanced user interface, support for graphs and charting, and the ability to share snippets of code with other programmers.
Try it today and don't forget to participate on the F# MSDN forum.