If you're interested in MySQL performance optimization as I am, you may find http://codenode.com/mysql/ helpful. My experience has shown me that poor MySQL performance is often not difficult to fix if you understand just a little about query optimizatiton and how to spot performance problems. Which is why for the former I write examples and explain the reasoning when I get a good chance to. And for the later, the Perl script mysnapshot because SHOW STATUS; is too unwieldy. mysnapshot can tell you more and is easy to read. And mybaseline which, admittedly is less important, but compares running server system variables to baseline or the my-small, my-medium, my-large, my-huge examples.

I hope this helps.