Q. I don't want ALL my reminders to go to OmniFocus. Can I just send some of them there?
1) In the Reminders app, add a new list named "OmniFocus". (Capitalized exactly like that.)
2) Quit OmniFocus (step-by-step guide
3) Tell Siri "Add research hybrid vehicles to my OmniFocus list."
4) Launch OmniFocus. Within a minute, "research hybrid vehicles" should show up in your inbox.
("Remind me to feed the cat" will still go in your default reminders list.)