To create links post to:
http://astrid.com/widgets/remind_me_link
For buttons post to:
http://astrid.com/widgets/remind_me
Both POST and GET requests work and support the following parameters
@param [String] title (Title for your task - Required)
@param [String] due_date (due date, YYYY-MM-DD)
@param [String] due_time (due time, HH:MM, only if due_date also passed)
@param [Integer] due_in_days (relative due date from today)
@param [String] source_name (name of website where this task was created from)
@param [String] source_url (url where this task was created from)
@param [String] repeat (RRULE recurrence token - see RFC 2445)
@param [String] notes (description for the task)
@param [String] list (name of list to put this task in)
Enjoy!