Reseller accounts remain a hot commodity in the hosting marketplace, but I expect to see a migration or reseller accounts from shared hosting services to virtual hosting very soon.
Virtual hosting takes advantage of a server's ability to virtualize itself into separate units, and there are many ways to do this:
The main thing needed to accomplish accelerate this process is an open-source reseller panel for virtual machines. This could probably be cobbled together with existing tools. I'll have to look into it.