I recently bought two of the Link Delight TW6816 based four channel cards for use with Blue Iris in two installations. I am using the drivers I found at the Bluecherry site under windows XP and 7 x64 with good results. Before BI I used Zoneminder but I've yet to try the linux techwell driver from gitorious but I see no reason why it should not work. I'm much happier with BI than Zoneminder especially the motion detection.