Richard Davidson-Houston (Channel 4 head of online products): "It would seem inevitable that we will go HD at some stage. I'll tell you absolutely straight that there is no one working on it. The problem for us, being a commercial organisation, is if we're going to stream in HD it costs us more money. Unless advertisers or somebody else is prepared to pay more money to us, then it's a very difficult thing to justify doing." [Story from Digital Spy]
Whether on not this applies to the Virgin Media version of 4OD is not known. Also, wasn't 4OD supposed to have its own Virgin Media portal by now (like the Beeb has with iPlayer)?