Following are the link .You bid on the project and you get the project.every kind of projects are available whether you are writer ,programmer ,software eng. or data entry operator.
http://www.elance.com
http://www.getafreelancer.com
http://www.guru.com
http://www.scriptlance.com
http://www.rentacoder.com
http://www.rentacoder.com
The following site is for all kind of people ...if you are expert in any field you get paid on by providing advice.similarly if you some problem ,you may pay and get the solution of your problem.
http://www.kasamba.com