Anyone know if it's possible to automatically add banners to free sites via H-Sphere? I've written psoft a couple of time over the past few days, but no repsonses yet.

No, H-Sphere doesn't support it. Of course you can use mod_layout - but that is completely different thing.

Thanks, that's exactly what I need. Is there an NT2K equivalent also?

I don't think so. I never heard about anything for IIS that would do that.