The HTC Touch HD is a smartphone by HTC (previously called High Tech Computer Company), released November 6, 2008 in Europe (it was not released in the US). http://www.slashgear.com/htc-touch-hd-release-date-is-november-6th-in-europe-1519280/ It's namesake main feature is a 3.8" high definition touchscreen with a 480 x 800 pixel resolution - as much as some screens several times it's size. http://www.htc.com/www/product/touchhd/overview.html

The HTC Touch HD was made specifically for digital media - pictures, TV, videos, and music videos, which is the reason for the high resolution screen.

The HTC Touch HD is optimized for the 7.2Mbps 3.5G network. The phone comes with Windows Mobile, and application features include Google Maps, stock quotes, a calendar, email, text messaging, and more.

A rear-facing 5 megapixel camera comes built in to the phone, capable of taking both pictures and videos. Headphones can be attached with a 3.5mm headphone jack. http://www.htc.com/www/product/touchhd/overview.html

HTC HD2

The successor to the HTC Touch HD is named the HTC HD2. The HD2 has an even bigger screen - 4.3", with the same 480 x 800 pixel resolution. The phone runs on Windows Mobile 6.5. Many of the other features - the camera, 3.5G, headphone jack, and very similar to the HTC Touch HD.