Net connection outtage - DNS issues?

Hi guys,

For the last couple of hours I've been unable to access about 50% of the pages I regularly visit. I switched my tcp/ip properties to the opendns servers but this doesn't seem to have made any difference, and my isp claim there is no issue on their end with any of their systems.

I've tried it in multiple browsers accross multiple machines, including a pda and a ps3, with no luck!

Here is the weird part:

If I try and access a page I can't get to (in this particular case, parcelforce.com) via an online proxy (onlineanonymizer for example) I can access the page just fine, albeit with the limitations that come from using a proxy.

Anyone have any ideas what the issue could be? I'm pretty much out of ideas.