Another possible approach is to look at stats at interconnection points,
although I'm afraid it is not as fruitful as it used to be.
LINX used to have great stats on members and peering data, but looks pretty
general know:
http://www.linx.net/tools/stats/index.thtml
appears it is all password protected these days.
If you want to create your own data you could probably patch together
something using pathchar (ftp://ftp.ee.lbl.gov/pathchar/) and possibly bing
(http://ai3.asti.dost.gov.ph/sat/bing.html) . Pathchar takes a long time to run
compared to traceroute so you can't do the mass data capture usually seen in traces,
thus hard to figure out an average for the top ISP's, but an intersting tool
all the same. May check out some of the links at CAIDA concerning its use in
projects - http://www.caida.org/tools/utilities/others/pathchar/
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