Are there any HD Channels? If not, do we plan on adding some down the road and when? Also, is there a full channel list or just that post with multiple entries of channels?

I bought 2 MAG250 boxes, they don't work on my 55" TV, friends 50" TV or small 19" flat screen, either doesn't show anything at all or shows all scrambled.. we tried all the different display settings and still no luck, any ideas?