If you plan to attend to the Qcon conference in London, UK, on March 12-16th 2007, you could get a 50GPD discount using the special promotional code javabloggers when you register.
And also, you could get a chance to win a *free* 5 day conference pass, writing an entry in your blog that mentions and links to QCon (like this one 😉 ).
More info at Simon Brown blog.
Updated 01/28/2007: Today, I have registered for the conference. I will try to live blog this event.