If you're interested in Oracle performance (or system performance in general) and you don't know who Cary Millsap is then I'm surprised. If you've never read 'Optimizing Oracle Performance', then I think you should.
Most of all, and this isn't to diminish Cary's other work in any way, if you've never had the pleasure of hearing Cary explain complex performance topics in a way that makes them fun and easy to understand then you really are missing something special.
Well now's your chance to put this right. Although it's pretty easy to hear Cary speaking at one of the many user group conferences he pops up at over the pond, the chance to hear him speak for a whole day in the UK is pretty rare.
Sign up. I know training budgets are tight at the moment, but I bet you won't regret it!
(Oh, and in case you think this is just rampant advertising for a friend, you should see the number of mails I get these days asking me to review things I don't have the slightest interest in, in the hope I'll blog about them. I only blog about things I think are worth my and your time ...)