35mm lens adapters cost thousands to buy, hundreds to build, degrade the objective technical quality of your video and make your camcorder an entire magnitude more difficult to use. And they won't make your video magically look like film. Nothing will.
On the other hand, by adding selective focusing options to small consumer camcorders, 35mm lens adapters have the potential to produce some absolutely gorgeous images. Do you need one? No. Do you want one? I know I do!
* 2009 Telly Award winner