By-the-way, Neulevel (.us and .biz) did an "experiment" along these lines
back in May of this year. It was short lived. At the time I thought it
was a bad thing, and I still do. And at the time I wrote and sent to the
ICANN board an evaluation of the risks of that "experiment."
.nu have been doing this for a long time AFAIK.
- kurtis -