Good Article On Bandwith vs Latency

From the bygone debates over DDR vs. RDRAM to the current controversy over Apples DDR implementations, one issue is commonly misunderstood in most discussions of memory technology: the nature of the relationship between bandwidth and latency. This article aims to give you a basic grasp of the complex and subtle interaction between bandwidth and latency, so that the next time you see bandwidth numbers quoted for a system youll be able to better understand how those numbers translate into real-world performance.
http://arstechnica.com/paedia/b/bandwidth-latency/bandwidth-latency-1.html