The slow, painful, expensive trek toward free-to-air HD TV channels took another tiny little baby step forward today, with wireless data chiefs Ofcom declaring that we'll definitely have HD TV through our telly aerials by 2012. Previously Ofcom and the major broadcasters signed a "non-binding memorandum of understanding" stating that they were all well up for it in principle - now it's 100% definitely happening. No more massively expensive Sky HD subscription required! A total of four HD...