Those that know me know that I spend a fair amount of time in the world of SQL Server internals and performance tuning. Over the last year I haven't been able to spend much time in that space due to other project priorities. It's good to see though that there's more and more information being published/blogged/etc. About SQL Perf-tuning.
The best thing about this article is that it really isn't a "SANs are bad because...." type article, but rather gives you examples of things to test in your particular environment.