Still, I too use the web, and I early in the project I considered the value of making harp-l a real web discussion group. Email is a sturdy but suboptimal technology for multiway discussion. But ripping up the list was unthinkable, and there seemed no way to have both the existing list and a dynamic live interface.
Fortunately, this is a perceived need in the world of mailing lists and discussion software, and I recently heard of beta software that may address it (http://m2f.sourceforge.net). Since Yahoo fills our browsing gap, this is not a priority project, but it does certainly interest me. I'd be interested in what others think.