There is no list of TV channels as this is not a set top TV box. This is basically a android powered mini computer and you have to customise it to stream available international channels. You can install programs like netflix, hulu and dish network apps. You can also install mediacentre software like xbmc and navi x which will help you to watch certain international channels, movies and tv shows. The everpresent youtube is easy to stream via the youtube app. The downside is its not a simple procedure if you are not computer savvy as it takes a bit of know how. Also dont expect to point the remote and click channels as its not going to be as easy unless you have the knowledge to do it. If you are merely looking for a set top box try Roku for american and european TV or Jadoo TV for south Asian TV. You will still need to pay for subscription to a lot of paid channels if you really want to watch decent channels. Dont forget a reliable high speed internet connection if you want this box to work well.
I don't know all the channels but here are 2 sites you can check out. http://www.boxtoptheater.com/products/g-box-midnight-android-tv-box-mini-pc and http://www.xbmchub.com/forums/xbmc-android-discussion/2673-g-box-midnight-reviewed.html
You have to install your own apps to get TV streaming. XBMC has a lot of good plug-ins made just for this, but you've got to know what you're doing to make it work. TOTALLY worth the effort if you know how.
The is a addon app called rtmpgui+ it supposed to stream live TV channels from all across the globe. I installed it into my xbmc...when I select a country inside this program it gives me script errors( which means it won't play). I watched youtube videos of rtmpGUI+ and it looks like it works fine (Here is an example: http://www.youtube.com/watch?v=77-rzPwtGbo). The program doesn't work for me so I disabled it...alot of apps in xbmc have script errors. This box is only good for watching 720p and dvd quality movies via IceFilms and 1channel, but if your internet connection is bad then this is not for you, because you will experience constant lagg while streaming.