HotDispatch
http://www.hotdispatch.com/

"The world's largest online marketplace dedicated solely to the needs of software developers"

The site wants to try everything, offering project proposals and code deliverables as well as questions/answers. Their complex knowledge base performs well.

They like the concept of fiveness. The buyer sets a price for his question and pays up to five sellers, depending on his satisfaction. Both parties rate each other. For bigger projects they offer several different ways to auction.

You can browse the archives to see plain text answers containing interesting short code samples, and the ratings and prices they earned.

The buyer offers any price from $0 up. He doesn't have to pay. The site counts on him to be afraid of earning too many negative ratings.

PROFIT FROM YOUR EXPERTISE

Requesters in the HotDispatch marketplace post computer-related questions or tasks of varying size, along with the price they are willing to pay for the answer or for efficient and high-quality delivery of a finished task. If you have technical expertise, you can make money on your own time by responding to Requesters' posts. Login to meet Requesters who need a convenient, effective, and quick place to get technical expertise, and are willing to pay for good answers.

ANSWER QUESTIONS

Questions, specifically, are competitive for Providers in the sense that HotDispatch accepts answers from up to 5 members. The Requester then has full discretion to apportion the price of the question among the respondents.

COMPLETE PROJECTS

You can also earn money by undertaking projects. Unlike questions, you compete in order to get the commission, and once you've been awarded the task by the requester you do the work. You get the agreed to price after the requester has accepted your work. HotDispatch also handles the payment collection for work commissions.

GET PAID ON TIME

HotDispatch handles the collection of payments from Requesters and disburses it to Providers, assuring timely payments.