Hmmm...
I wonder why OpenOffice.org Calc appears to decide that good defaults for "importing" a CSV file are to have the seperator set to tab or semicolon, and not comma... Seems odd to me, opening the file in gnumeric did exactly the right thing, without asking me anything... Opening in OpenOffice.org Calc throws up an import dialogue and expects you to know roughly what the file looks like, and the defaults are 'odd'.