The following books are all give coverage of the Data Protection Act. For further detail, including online purchase from Amazon.Co.UK, click on the appropriate link.

Data Protection Act 1998
Angus Hamilton, Rosemary Jay

Data Protection Act 1998: a Practical Guide
Heather Rowe

OTHER LEGAL SITES OF INTEREST

HMSO
The Stationary Office

OVERSEAS

The Sarbanes Oxley Act 2003
US legislation kit covering business practices.

Thomas
General US legislation source.