The latest release of SQL Developer slipped out yesterday.
I've been trying the pre-release version and its starting to become a really useful tool. My copy of 1.1 final is downloading as I type.
Update: When I got to work this morning I tried automatically updating the copy of 1.0 on my work machine. It doesn't appear to work. It looks like you have to download a copy of 1.1 and install it yourself.