Fusion Tables launched last year in Google Labs help users manage large data sets. "Fusion Tables isn't a traditional database system focusing on complicated SQL queries and transaction processing. Instead, the focus is on fusing data management and collaboration: merging multiple data sources, discussion of the data, querying, visualization, and Web publishing," explains Google.
Fusion Tables has graduated from Google Labs in Sep and it'll become a Google Docs app. As you can see in the screenshot below, Docs includes fusion tables in the list of document types and there's also an icon for fusion tables. Users can already import tables from Spreadsheets and sharing works just like in Google Docs.