A more concise cheat sheet: http://dungpa.github.io/fsharp-cheatsheet/
Things like:
* how do I read a text file
* how do I write a text file
* how do I download a file using HTTP
* ...
- http://rosettacode.org/wiki/File_input/output#F.23
- http://rosettacode.org/wiki/HTTP#F.23
However, it's probably not terribly interesting since those are things that exercise the BCL, so any C# example would do to show you how it's done.
People are doing themselves a disservice if they scramble for a collection of cheat sheets since there are so good books available.
There's no better way to invite help from strangers. :)