There are PC options surfacing too
Stealth Imaging also have relatively low cost cards (4 and 2 input devices) for transcoding DV and other content to H264 - at first glance I thought this was a rebadged device from them.
The first mention I'm aware of is on the Quicktime lists Aug 2006, which predates this device by some time :
As noted in your article, it still takes a tremendous amount of raw CPU "grunt" to encode to H264 (and VC-1 video) near realtime, even iif GPU uplift is applied using a good graphics card to assist the encoding.
So I reckon there will be a market for these sorts of devices for a good while yet. Any idea of UK retail sellers for the Elgato though ?
Cheers - Neil