Luc is running a single Fermi and the results are awesome.
I've still got four Nvidia machines to get switched over, hopefully by the end of the week.
I'm going to wait and see if they get the ATI situation straightened out before the challenge. If they do then all of mine will be there too. I believe Lauren is going to do the same.
If everything works out then the four of us should be kicking out well over 3 Mil. a day. Throw in what everyone else is doing and we should do well for the challenge.