while the as_number->as_name lookup is usefull i would have opted for adding this feature to one (or more) of the existing utilities (traceroute, mtr, paris-traceroute) instead of crafting yet another command.
-A gets you the AS, my tool looks up the name. So you can see "Oh, it goes from Comcast, to Cogent to Google." cool. Rather than ASNs which you don't immediately recognize.