Best way to find tenant prospects

[Ken Latchers]

How would you rank (best to worst) the following methods for bringing in GOOD tenant prospects?

- local newspaper ad
- craigslist
- sign on property
- a listing service such as roommates.com, rent.com, apartment.com
- asking current tenants for referrals
- putting up notice on bulletin boards (groceries, laundromats, churches, etc.)
- other methods?