For fellow Canadians and neighbours to the south, you may find useful a function to validate the formatting of a Canadian postal code. More than once I've had to work with web programmers on checking that a postal code meets the A1A1A1 style, so carry around a function that simply returns a true/false bit if a submitted varchar value does not meet our Canadian postal code standard. I hope you find it useful! Thanks to a colleague Patrick M. for quality checking this script.
For most DBAs, normalization is an understood concept, a bread and butter bit of knowledge. However, it is not at all unusual to review a database design by a development group for an OLTP (OnLine Transaction Processing) environment and find that the schema chosen is anything but properly normalized. This article by Brian Kelley will give you the core knowledge to data model.