OK, I just checked 'em both out. Interlink's WinDVR works quite well, but it has a problem of taking up large amounts of system resources (much like ATI's software). Cyberlink's PowerVCR doesn't have that problem, but unfortunately it's image quality is worse, having a noticable fuzz.
I'll have a space for both applications, WinDVR for solely watching TV and PowerVCR to watch TV while doing work.
I'll try the video capture options next to see which performs better.