Reply to comment:
Nick Hilliard •
incidentally, i recently saw a graphviz visualisation of lots of separate traceroutes to a single point. This might be an interesting way of visualising bogon sinks, and it was certainly a lot easier to see connectivity loss via a graph like this rather than depending on the output of 50 traceroutes, one on top of the next. Graphing the connectivity tree by IP address created quite a lot of clutter, but perhaps it would be possible to graph the traceroute connectivity by intermediate ASN?