No problems here. Safari on the iPhone, FireFox and Chrome.
I did get some goofy Malware attempts a few days ago (not from here) that Avast (desktops) and Panda (laptop) caught before anything happened.
DNS caching screws up sometimes, and even "high level" ISP's like Level 3 get goofy. Doing a simple tracert may tell you about external routing problems.
Just for fun, try a different free DNS... http://code.google.com/speed/public-dns/