Marketing
We all know that marketing is key to locating sellers and buyers. Maybe we could have an article on advertising or a forum where we exchange ideas about what has worked and not worked as far as ads go:
Penny savers
bandit signs
$100 Bill Business cards
Magnetic card signs
etc.
Emily C. 
Emily,
Keep reading Scott Risters articles on this site. You can find his last article "What is a motivated seller?" He deals with just marketing to get leads. Is course will be available on this site pretty soon and it deals specifically with real estate marketing.