Those JB Zark frames have been around a while. Well, they were introduced maybe a year ago, but I don't think they were too popular. You can get them HERE if anyone's really interested. As far as I can remember, they weren't anything special - just a long-ish, natural-orientated frame with a fairly low bb. That one looks a bit different though (EDIT: OK I just looked it up - it's the "new" JB Zark - Reminds me of an Echo Control).
As for the other one, can't help you. Zebdi dropouts, Levelboss top tube, Echo-ish chainstay yoke. Another random far-east frame, at a guess :-