Do you know the YouTube streaming severs? I think I need to capture some packets to be certain I have identified the source, but a comparison trace from an AT&T connection would be interesting. I used to see a direct connection between 'sbcglobal.net' routers and YouTube; but I've not been an AT&T customer for a couple of years. I might try and catch a route from a friend's "at&t Yahoo! HSI Basic" connection. YouTube is painful to watch from a 768/384 connection, though (she won't pay more for faster).
Here is my current route from a Sonic.net connection:
Tracing route to nuq04s08-in-f4.1e100.net [74.125.224.100]
over a maximum of 30 hops:
1 <1 ms <1 ms 1 ms 192.168.42.1
2 26 ms 25 ms 26 ms 173-228-7-1.dsl.static.sonic.net [173.228.7.1]
3 25 ms 24 ms 25 ms gig1-4.cr1.lsatca11.sonic.net [70.36.243.13]
4 25 ms 24 ms 24 ms 0.xe-5-1-0.gw.pao1.sonic.net [69.12.211.1]
5 25 ms 24 ms 25 ms 0.xe-6-0-0.gw3.equinix-sj.sonic.net [64.142.0.185]
6 26 ms 25 ms 26 ms eqixsj-google-gige.google.com [206.223.116.21]
7 27 ms 27 ms 26 ms 216.239.49.168
8 27 ms 26 ms 27 ms 64.233.174.109
9 26 ms 27 ms 26 ms nuq04s08-in-f4.1e100.net [74.125.224.100]
Trace complete.