As per Bill Young's suggestion, I checked out the Google Docs Spreadsheet to evaluate whether it can be used for collaborating on and modifying a shopbot cut file.
After a little digging, I found the following....
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Each spreadsheet can be up to 10,000 rows, or up to 256 columns, or up to 100,000 cells, or up to 40 sheets -- whichever limit is reached first.
Each user has a limit of 1000 spreadsheets and the limit on spreadsheets open at one time is 11.
You can import spreadsheets up to approximately 1 Mb in xls, csv, or ods, txt, tsv, tsb format.
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Well, the 10K row limit leaves this open for smaller cut files, but don't try 3D. ;-)
Are there any Google Docs users out there who have used the spreadsheet to work on shopbot files?
-Scott