You are probably asking yourself, what Query Builder inside SQL Developer (Oracle’s free tool to manage your databases (Oracle, MS SQL, MySQL, etc.)) I am talking about. I don’t know why but Oracle has hidden the Query Builder “very well” in it (talking about good User Interface practice here…).
Anyhow, to get to the Query Builder you have to have a SQL Worksheet open and then right + click and chose the Query Builder from the Context menu, there is no shortcut and no other way to get to it. Well, at least, once you open it you can do quite advanced SQL with it 
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Sweet - didn’t know that was there!! You should post something on their forums about that!
Jim
Downloaded the SQL Developer tonight after reading your post, and now the SQL Builder is not even present through the SQL Worksheet. I posted my screenshot here http://oroede.org/images/sqldeveloper.jpg
From your screenshot it looks that you are using a MySQL database, right? If so, the QueryBuilder is only available to Oracle database connections (at least, it seams so from my experience).