SQL Server Central today featured a script for generating random data using a tally table. While there’s nothing wrong with that, I prefer using a web site, GenerateData.com. They offer the advantage of you being able to generate CSVs ready for import of the fields that you need including range bounds, random names, email addresses, etc. The data generator is also available on GitHub for customization. The web site limits you to 100 records generated, if you register and pay $20 you can generate 5,000 records. As a registered user you can also save your datasets, which is a pretty cool feature.
Very useful tool to keep around when you need to load up a database with reasonable data.