Robert Hodges of Continuent presents "Portabe Scaleout Benchmarks for MySQL" at the 2008 MySQL User Conference and Expo. (video is embedded at the bottom of this post).
Database scale-out architectures promise tremendous capacity increases simply by adding hardware. There are, however, significant differences depending on the scale-out approach you choose. This talk presents a new set of open source benchmarking tools called Bristlecone (http://bristlecone.continuent.org) that allow any user with access to Java to set up and start to run performance benchmarks in a few minutes.