Searching For a real "Sales God"

I recently completed my first freelance project, and it made me realize that while I enjoy building websites and applications, sales and client acquisition are a completely different skill set.

For freelancers who prefer focusing on development, how do you handle finding and converting clients?

• Do you partner with commission-based salespeople or business development professionals?
• If so, how do you find trustworthy people?
• How do you structure commissions and responsibilities?
• Do you use contracts, revenue sharing, or referral agreements?

I'd love to hear how others have approached this and what has worked (or not worked) for you.