Is it possible to create a new Column Type in SharePoint? I did a little looking around but didn't find anything... Below is an image that I hope clarifies what I am talking about:
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yes, it is possible. In technical terms, you need to create a new field type. Check the article below in SharePoint SDK to get started.
I know this question has already been answered but here is another article that may help if you are using WSS 3/MOSS 2007 from MSDN Magazine (May 2009):