ROCK ON!!!
Thanks Joel. I was able to use a combination of du and df to get the sizes of the volumes, percent full, and sizes of my shares, writing out to a text file. Then I used Cronix to set a job that appends that info every night.
PS, I enjoyed your comments at the Server Admin class @ MacWorld.
So, now here comes the big one. (hey if I get part working, why not go all the way) Any ideas on parsing the text file into tab separated so I can import into Excel and make a graph?