Nitpicking that matters: changing default forms on a SharePoint 2007 list

This is a fairly common request, but the solution is often missing one crucial point.  To use a custom New/Edit/Display form on your list, proceed as follows:

1. Open your site in SharePoint Designer.
2. Right-click the desired List (under the Lists node) and select Properties.
3. Click the Supporting Files tab.
4. Under Content type specific forms, select the Item content type (this is the part most people forget).  If you are using a custom content type, select that; just make sure that the Folder type is NOT selected.
5. Use the Browse button to select your custom forms in each category.
6. Click OK.