What's your main area of expertise? Go to online communities where that expertise is discussed and join the conversation. When somebody enters the conversation that needs a problem solved, you'll be headed towards a new client.
Social networking is your friend. A month ago, I got a new client using Quora - through a question I asked about how to find new clients.
The more companies you talk to, the closer you'll get to finding somebody that needs you. Remember, they want you to consult for them as much as you want to consult for them, so go out there and find them. From my perception, the environment is very pro-consultant right now.