I am testing the new Google Spreadsheets as there is a new feature I really need: the 200 sheets limit has been lifted (more info here: https://support.google.com/drive/answ
If you enable "Anyone with the link sharing" for spreadsheet, here is a simple method to get range of cells or columns (or whatever your feel like) export in format of HTML, CSV, XML, JSON via the query:
https://docs.google.com/spreadsheet/tq?key=YOUR-KEY&gid=1&tq=select%20A,%20B&tqx=reqId:1;out:html;%20responseHandler:webQuery
Downside to this is that your doc is still availble in full via the public link, but if you want to export/import data to say Excel this is a perfect way.