Oracle has released an 'early adopter' version of the the data modeling enhancements to SQL Developer.
See the OTN article for details.
I haven't tried it yet, it will be interesting to see just how well it works.
Here you will find posts that are mostly about my work as an Oracle DBA. There may occasionally be other topics posted, but by and large this blog will be about Oracle and other geeky IT topics. Perl will likely be mentioned from time to time.