We are working as quickly as possible to fill out the server SuiteScript documentation and include examples.  I thought I would include an example I developed this evening to handle a customer request, which was to include the primary contact's fax # on the sales order.  Hopefully taking a look at this will give you scripters a hint of the power you will have available with SuiteScript.

Note for the example below to work you must create a transaction body field on sales transactions with id = "contactfax" and store value unchecked.  Because of an issue fix, the example will work in the version of NS coming out next Monday, June 5.