A bit of feedback later and here is a quick mod of the logo to create a black version. The proportions now fit the 480x320 iPhone res - the second image here is actually that size with the URL version - seems to work still quite well at the small res.
I considered trying the 'lines' as white rather than black - but it takes on a slightly strange effect - it would take some more work to get that looking cool. I have a version with stars as well, but it is pretty nice with the clean look. I like the extra purity of the white background version, but the glowing black background is ok.
Anyhow, this version seems to be working (big then small version):