Need a general performance book

Hi,
Does anyone use or know of any good general performance guides? I just need some general guidelines for optimising my applications or maybe some common pitfalls to avoid.
Thanks

Go to http://www.javaperformancetuning.com for lots of tips and book references
steve - http://www.jamonapi.com - a fast, free, performance tuning api

Thanks Steve, everything I could ever need seems to be somewhere on this site