Sorting Tables in Google Docs: Yes, You Can
Good news, Google Docs users: The TableTools extension for Firefox lets you sort tables, a capability that's currently missing from the Docs word processor.
Alex from Google Operating System explains how to use TableTools:
To use the extension, you need to right-click on the table and select one of the available options: sorting, filtering, copying data as tab-delimited text or as HTML. Google Docs replaces Firefox's contextual menu, so it's necessary to press Shift + Right-click in order to bring back the original menu. Select from the menu "Sort table column as" and choose the appropriate data type.
In case you're keeping score, Zoho Writer doesn't offer table sorting either. However, TableTools isn't Google Docs-specific: It can sort any HTML table, meaning it should work with Zoho as well.
Speaking of tables, don't miss Dave's excellent video tutorial on using Excel pivot tables. They're kind of apples and oranges, table-wise, but who am I to ignore such an obvious plug?