Divius the ChaoTic - Blades of Wrath has made a nice horizontal hotkey skin that I use - it nicely reflects the keyboard layout and is particularly bard-friendly.
I would like to modify the skin to place a number 1-10 above each slot, or alternatlivey on top of each button similar to the numbered buffs from this skin:
I recently downloaded a horizontal numbered hotbutton. Here is a portion of the xml file, perhaps the LAbel portion is the part which denotes a number.