Every so often my TV will tell me that it’s discovered new DTV stations, but when I scan, it finds nothing. As a result, I get the shits and curse Panasonic for having a TV that’s smart enough to tell me when it detects changes to the digital signal, then ignore the announcement. But Gus over at Lifehacker has pointed out that sometimes you need to rescan for channels, like when SBS upgraded its digital transmitters last week. The benefit of this upgrade is that you can now get 720p on SBS HD, plus a seven day EPG. And let’s face it – any upgrade to HD is worth a quick scan now, isn’t it?