It's PROBABLY a router problem.
I've been having odd troubles throughout the Net recently--a friend's UT2k3 server on a dedicated T3 (! rich bastard) will occasionally be rendered unplayable by a SINGLE crappy router a few hops from his server. And by unplayable, I don't mean like 150 or 200 pings--no, my friends, I mean EVERYBODY gets pings in the 500s instead of 70s.
I've had trouble getting to nV, Envy, Slashdot, numerous smaller sites, you name it, it has had trouble loading for me.
Don't know what to tell you, but I think that a lot of it might be leftovers from Slammer.