As a sometime consultant there are two things that I really like, technology that makes my work more efficient and getting paid for sharing my knowledge. Now a new web based service offering offers both.
Ether.com enables you to have your own phone number with a fixed price per minute or hour or call that when your phone rings via this number you know the person is ready to pay. ether takes care of the financial transaction with your client and pays you your proceeds.
You can then market this number anywhere and everywhere that a potential client might find it. The key is you know that if the phone rings, you will be paid.
Check out ether.com, they are still in Beta, put I think this is a terrific service idea.