I hacked together a pipe tool for Google spreadsheets a few weeks ago. I need to get data from spreadsheets from other people, and then spit them back again. I wrote the pipe tool so that I can go

    googlepipe --command get --document $DOC_ID | $SCRIPT | googlepipe --command update --document $OUT_DOC_ID

It's a pretty neat way to work, and being able to revision control all of the input data, scripts and output data is a godsend.