We have released on codeplex a SharePoint 2007 project called open link in new window. The project is a simple list definition which allows you to render SharePoint's internal links with the option to open them into a new window.

SharePoint 2007 is missing a feature which allows you to choose the internal link's target. All links located in SharePoint's Lists will always open in the same browser's window.

Installing this solutions, a new Feature containing a List Definition with this capabilities will be avaible.

Once the new SharePoint's List have been created from this new List Definition, you can choose if you want to open links in the same window or not.