The Preset Array is an alternative to the Array Object. It allows you to specify an array at edittime rather than having to run events to load your array or having to load a text file into the array. It takes two parameters to do this - a string and a delimiter. The string has values (be it text or numbers) that are stored as if they were a 1D array (eg "1, 2, 3, 4, 5, 6" without quotes) and then loaded using x*width + y to find the value. So, when loading "1, 2, 3, 4, 5, 6, 7, 8, 9" in a 3x3 array, it will look something like this visually:
If you're confused, see the example.
NOTE: There will be a Flash version soon, I'm very busy at the moment so it may be a while.