there are a lot of variables.
Bingo. You can get 1 lb off of 1 plant if you do it right. http://www.highgrade-seeds.com/cgi-bin/forums/YaBB.cgi?board=BuySell;action=display;num=1205102246;start=200
over 16 oz from one plant. We all know earl too, he don't BS around. If anyhting I'd say it probably weighed 17 oz and that is just what made it to the scale!!
To give you a bit, if yoiu wait till your plants are out of seedling stage, say, 3 weeks after sproutling with no cloning, and then count 4 more weeks, giving the plant a full 4 weeks in vegitative state, you will give the plant enough surface area to grow just about it's maximum yeild without doing some major topiary reconstruction.
In theory, at least in the state I am in, each plant would count for 1 lb. It is possible, and if you get cought in states where it ain't legal to grow, some states count each plant as possession of 1 lb. Crazy I know.
Do your homework, do your math, and you will more than likely supercede your expectations. I have been told and have seed but have not performed, .5 gr of dried bud per month per watt. A good grower should be able to do this. I have not attained this status yet.