I had good luck with CL but i made it sound like an already going thing. Had a Proboards site up and ready for people to sign up. And I got a few scooterists I knew to sigh up before the announcement.
Set up the first ride from a well known location and do the ride even if it is only two of you. Then do a ride report and post that around. Things should build from there. I hope so, because that's the stage i'm at. My first ride had 3 total but i have a great Kymco dealer who helped make it look like a big deal. So now the buzz is started.
In a little over a month i have about 15 signed up. Even had a few "Dawgs" came on at first and helped it look active. I'm sure some of us would be willing to do that on yours.
Also did the business card thing. But CL has been the best. I get 1 or 2 new people every time i do a post. I got my best and first member from an announcement on SD.