Over the years I have been asked several times and had lots of talks about the type of license to apply to my project, sorry there is no easy answer. Every time someone asks I always point them to the following list on www.codeproject.com for a reference.

When you are choosing a license you need to make the choice yourself based on what the project is and what you want to get out of it. In some cases it will also depend on the libraries and code you have used in your project. But in the end it is your choice and if required you should seek legal advise just to make sure.

Direct Link to the CodeProject list: http://www.codeproject.com/info/Licenses.aspx