So i upgraded my Comcast cable to HD, bummer, it's only 720p. Where is the 1080p?

When I had Comcast,the stations varied, some were 720p, some were 1080 (i or p, I don’t recall).

Six feet away I could not tell the difference between 720 and 1080.

No network in the US is currently capable of broadcasting in native 1080p. Cable and over the air broadcasting is at 720p60 or 1080i60 encoded with MPEG-2. (The 60 stands for frame rate, which in video is 60 frames per second, as opposed to 24fps of film).

Some satellite companies are able to convert the signal they get to 1080p/24–30.

It’s going to be a few years before US networks are at a 1080p standard. And further, there are even higher capabilities of high definition than 1080p. XD: 1440p. There are video cards that are 2560×1600. For right now, you’re probably at the top of the consumer heap. Sorry. 1080p sets are good for Blu-Ray DVDs, though! :)

Your eye can’t tell the difference if your screen is smaller than 42” or if you are sitting further than 5–6’ away as mentioned above.

Random link

You should try changing your cable box to 1080i. I believe Comcast broadcasts in 1080i, at least they do for sure in my area. However, my box (which is an HD DVR box made by Motorola) came with 720p as the default. You can change this setting pretty easily by yourself; you turn off the cable box (leave your TV on), and then press the red “Menu” button on your Comcast remote. You should get a white setup screen, and one of the top two settings is the resolution setting. Use your directional keys on the remote to highlight the resolution line, then left or right direction to get to 1080.

Hope that helps.