I love the new grid guide!!..but would like to be able to more quickly make it through the 100s of channels listed. Number input would be the ideal solution, but the only way to do that is with a keyboard (until Apple allows logitech to emulate a keyboard with the harmony hubs or allows HDMI-CEC input from the televisions). Another way would be to list 10s (10,20,30,40,etc) to the screen left or right of the guide categories…and maybe even 100s as an additional menu layer. Also, allowing the end of the guide list access from the beginning of it…push up when on channel 2 of the guide would take you to the last channel in the guide.
Just some thoughts. There may be a better design solution out there.