We're really loving floating plants - they not only look good but offer shelter to fish in two ways - shelter from very bright light above them and somewhere to rest. Small fish can in particular rest in the trailing roots that floating plants offer, and odd as it seems, some roots can actually look quite attractive. I think the main reason is that they give your tank a very natural look as floating plants would be very common in the wild.
Ultimately we're trying to replicate what nature offers and no better way than by offering floating plants. The latest one we have available is called Trapa natans - it's been around for a long time throughout Europe and Asia (Eurasia) and if you like the sound of it you can find it here Trapa natans.