Mobile High-Definition Link
Mobile High-Definition Link (MHL) brings HD content from a portable device (i.e. a smartphone) to the TV. MHL technology is promised to work with any existing TV and smartphone. If your TV doesn't come with a built-in, physical MHL chip, there is the adapter that will be available from Best Buy.
This might sound a bit like the new iPad 2 HDMI cable accessory, and it is. But this one is promised to be far cheaper. The price tag hasn't been announced yet, but it will be far under $40 when released within a few months. It will also be bundled for free with select (yet currently unknown) mobile phones.