What would be interesting to try is to load it via an IP address rather than a DNS lookup. Since you are both having problems with comcast it may either be a DNS problem or a routing problem. So just for fun try it as
http://209.92.71.145
The next step would be looking at the routing table between the machine (basically how it gets from point a to point b. Here is my table example (the command is "traceroute thechipboard.com"). You see it takes like 13 hops before it even gets to the internet backbone. But measured in milliseconds its seems instantaneous.
1 mygateway1.motorola (192.168.15.1) 1.883 ms 1.135 ms 2.314 ms
2 * * *
3 ge-1-1-ur01.mtlaurel.nj.panjde.comcast.net (68.86.223.145) 9.776 ms 8.448 ms 9.671 ms
4 po-20-ur01.burlington.nj.panjde.comcast.net (68.86.210.181) 10.439 ms 10.649 ms 9.387 ms
5 po-10-ur02.burlington.nj.panjde.comcast.net (68.86.210.162) 10.192 ms 10.381 ms 9.447 ms
6 po-10-ur01.pennsauken.nj.panjde.comcast.net (68.86.210.166) 10.384 ms 10.654 ms 9.641 ms
7 68.86.158.146 (68.86.158.146) 9.696 ms 10.327 ms 9.334 ms
8 po-10-ur01.audubon.nj.panjde.comcast.net (68.86.210.170) 9.903 ms 12.020 ms 8.807 ms
9 po-10-ur02.audubon.nj.panjde.comcast.net (68.86.210.174) 10.788 ms 11.077 ms 9.310 ms
10 po-20-ar01.audubon.nj.panjde.comcast.net (68.86.210.178) 22.348 ms 124.538 ms 211.653 ms
11 po-90-ar01.plainfield.nj.panjde.comcast.net (68.86.208.1) 12.983 ms 12.920 ms 13.692 ms
12 68.86.90.37 (68.86.90.37) 16.065 ms 14.918 ms 14.507 ms
13 te-3-1.car1.newyork1.level3.net (4.71.172.109) 15.129 ms 16.688 ms 16.390 ms
14 unknown.level3.net (63.208.174.2) 17.230 ms 15.760 ms 17.512 ms
15 so-0-2-0.core2.asbnva16.uslec.net (169.130.81.77) 38.651 ms 38.471 ms 38.285 ms
16 so-1-3-0.core1.asbnva16.uslec.net (169.130.81.93) 38.737 ms 37.995 ms 38.545 ms
17 ge-1-1-0-232.core2.phlapafg.uslec.net (169.130.98.66) 35.366 ms 36.716 ms 36.417 ms
18 ge-1-1-0-10.core1.bhlhpaea.uslec.net (169.130.98.35) 25.104 ms 24.405 ms 23.518 ms
19 coloswitch02-abepa.fast.net (209.92.0.19) 27.347 ms 23.888 ms 24.655 ms
20 209.92.0.130 (209.92.0.130) 22.374 ms 24.641 ms 23.996 ms
21 ldh0120-shared.uslec.net (209.92.71.145) 24.074 ms 23.292 ms 24.867 ms
