I wrote this article on computed columns to support some of the teaching I do for my beginner to intermediate level performance tuning class. It's not a technique you'll apply that often, but I think it's used less often than perhaps it should be. Hope you'll take a look and add a comment to the article.
I'm Andy Warren, currently a SQL Server trainer with End to End Training. Over the past few years I've been a developer, DBA, and IT Director. I was one of the original founders of SQLServerCentral.com and helped grow that community from zero to about 300k members before deciding to move on to other ventures.