JavaZone in Oslo is a really good conference, and I’ve been there 3 times now. The last two years I’ve only been able to attend one day, but it’s been good anyhow.
You can find slides/podcasts/videos from the sessions here.
One of the sessions I attended that provided the most hands on info I can use in my daily work was Jonathan Purdys presentation on The Top Ten Ways to Botch an Enterprise Java Application.