There are many sites where you can gather information resources and data handling files, here are a few to get started:

The Big Brown Envelope: Downloadable How too guides on using datahandling packages. There are also some example files. Look for Police and The Sweens.
http://www.bigbrownenvelope.co.uk

WBOL: Window Box online RM list of helpful downloadable files and lesson plans. Most work with Information Workshop, Information Magic and First Workshop. Lesson plans are in MS Word. You will need to download the WBOL software first to view these files. Or ask RM for their CD ROM. Details on the site.
http://www.wbol.co.uk

Example data to work with Jordan Hill data - dowloadable from the Heinemann site on
http://www.heinemann.co.uk/mathsmatrix/gcse/gcsehomepage.asp

Try the censusatschool site. This has sample data and worksheets
http://www.censusatschool.ntu.ac.uk/curriculum1.asp

Northumberland Grid for Learning: Includes resources for databases using First Workshop at KS1
http://ngfl.northumberland.gov.uk/ict/default.htm