It's a very good question. I believe there are a number of steps to getting it up and running. The offset portion, for example, will take a bit of time.
I know for certain that much effort is actually ongoing currently. For example, the EPA is looking at offset methodologies, looking at the CDM Executive Board, what's come through there, what's coming out of Canada in terms of.... I believe Alberta has an offset program. So they're looking at what's out there, trying to figure out what works, what doesn't work, in a U.S. context. So people are working on it today.
As to when it actually could be up and running, I believe the earliest that people are suggesting is 2012, and maybe 2013 might be more likely. That's just a best guess, though. I'm sorry I can't give you more specifics.