I have an update
One is this still works in Mountain lion.
Two is I discovered when your in 10.8.x then use Automator to open the workflow (that was in my first post) and the you can use the toggle bar (in the right hand window) and choose between two Reminder entries. In mine the second Reminder entry was for the new 10.8 Reminders application. So save the change you made and now the workflow saves to the new 10.8 Reminders application.
Mac Pro Dual 2.8 Quad (2nd gen), 14G Ram, Two DVD-RW Drives, OS X 10.8.3
2006 Mac Book Pro 2.16 (first Gen) OS X 10.7.4
2TB Time Capsule, 2 TB
32G iPhone 4S Black, iPad (3rd Gen) 32G Black