The UV Delete tool lets you delete UV selections from your UV map. This doesn't affect the mesh selection in the viewport, it only deletes the UV information from the UV map presently displayed in the UV Texture view.
To delete UV selections do the following:
1) In the 3D Model View, select the geometry.
2) Change the layout to UV_3D_Split.
3) In the UV Texture window, select the UV map components you wish to delete.
4) On the Texture menu in UV Operators, choose Delete.
