Harmony Flush Activated Toilet Seat

Although not as advanced as the Japanese inspired Brondell Swash, the Harmony toilet seat seems like a pretty ingenious product. The seat makes use of a small connector that runs from the bottom of the toilet seat latching mechanism to a float that you place in the toilet tank. When the toilet is flushed, the float lowers with the water in the tank which triggers a lever on the connector under the seat, which in turn releases a latch that activates the seat closing action. The seat closes very slowly for, as the company refers to it, a pinch-free close.

The unit is currently only available in Home Depots of the American Midwest.

Also: Froogle Search gives a price of about $80.
Promo Video of the seat in action.

Link: Harmony Toilet Seat