Dave Winer writes about Replay Radio, saying it sounds perfect. It's interesting, but the one I'm really waiting for is the Radio Shark (which I've mentioned here before). It does everything Replay Radio does, but a bit more. The big thing is that it comes with a USB AM/FM receiver can record from any AM/FM station. This makes it a bit more useful. It also gives you TiVo like features in that you can pause live radio. Yeah, it's Mac only, and I'm not really sure if Griffin tends to support Windows that much (I just checked, they definitely do support Windows for some of their products). But I'm sure the Replay Radio folks don't intend to support the Mac either.