Very specfic and odd network issue

Connected via my wireless network, this site:
http://wiki.contextgarden.net
will not load via any browser (Firefox, IE, Safari, wget).
Connected via ethernet, it loads fine.
All virtual machines (windows) on the MBP also fail to load the page over wireless.
I have no other web/net problems using wireless on the MBP.
All other computers in the house, windows, macs and UNIX load the page fine, wired and wireless.
If I try to get the page using wget with debugging, it just hangs after the initial redirect or, after 30 minutes has managed to get a few bytes and then freeze.
As I say, I have no problems with the network at all apart from this and this seems to be the only site I have problems with and only on this machine via wireless.
Any ideas? It was like this on 10.5.4 too but I assumed the site was having trouble before I checked on another machine.
OSX 10.5.5 on a Macbook Pro

It was almost certainly an MTU black hole issue and replacing my 4 year old router fixed it. Didn't have time to mess about with MTU values.

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