Looks nice, but the constant floating around and 'wiggling' really bugged me. It took me quite a while to figure out how to add and remove things.

It also reminded me of an ORM tool which I helped build in college called nORMa. It was a plugin for Visual Studio and was great for designing complex databases.

http://www.objectrolemodeling.com/AboutORM/ORMTools/NORMA/ta...