I love the way you guys offer $100 dollars for new signups and $200 off longterm sublets. Such a great way to get people excited to use the site. My dad has done rental properties for years so I've watched as the market has evolved. What you guys are doing and the way you are doing it is epic!
This is the same way I started designing! My dad would have me design ads for his businesses growing up and I was horrible at first, but as I kept designing the skills started to come. Keep it up :)
Also, Check out Smashing Magazine, http://www.smashingmagazine.com/ it is a great resource for design! and if you get more into web app design 37 signals has an awesome blog called Signal vs Noise. Check it out!