I guess I wasn’t fast enough signing up for Google Spreadsheets. Oh well. I see that there is an “invite” system, so maybe I’ll run across someone that has an invite to spare. (Update: I just got an invite and am trying out Google Spreadsheets now.)
In the meantime, I’m enjoying watching Philipp Larssen’s screencasts of Google Spreadsheets.
Go here, then you can get a Google Spreadsheets account!
https://www.google.com/accounts/ServiceLogin?service=wise&passive=true&nui=1&continue=http%3A%2F%2Fspreadsheets.google.com<mpl=invited-google