These are just a few of many different resources available online which provide free access to datasets. Creating your own dataset or getting datasets from your work environement is also handy. Think about things like:
- Web server logs
- Sales data
- Your collection of books, CD's, DVD's (particularly if you have a large collection!)
- Door counter data (tracking how many people enter/leave)
- Call logs from your telecomm provider
- Inventory data
- ... and so much more!