I was just checking my various search spiders and Googlebots for interesting articles after a 3 week blogging hiatus and found this great presentation (440k PDF) from Tom Daly. The article was presented at a recent Java developer conference in Australia and provides some great performance tips for GlassFish, Java DB (aka Apache Derby), MySQL and Postgres. The preso. is based on experience Tom gained during Sun's recent SPECjAppServer 2004 submissions.
There are also a couple of other GlassFish related presos. available from the same conference - full list here.