Nik Software make some great filter plug-ins.
Today they have announced that Viveza is available as a lightroom plug-in. It is a free upgrade for those with Viveza for photoshop (Me).
For those that don't know what Nik Software make, look here, especially look at the 'lessons' in each filter as they show some amazing results. Nik have announced with the lightroom addition of viveza that all their plug-ins will be upgraded to lightroom compatibility within a couple of months.