The general advice on Java IDEs is to not bother; get a good text editor and Sun's Java SDK and do it yourself. But I also hear recommendations for things like KAWA. It'd be kinda neat to have Visual-C++-style autocomplete dropdown menus, a sort of docs on the fly thing for classes. And an editor-centered debugger might be fun. But I'm really looking for an IDE; I'm happy with the former solution.