In the created project you will find already working examples wit the core libraries you has selected in the wizard before. Finely here is an screenshot of auto-help, and auto-suggestions. This looks real powerful at for me.
Aptana is a new IDE, the current version is 0.2.7 but it already has some interesting features and it the best for me and my Java-scripts. Aptana rapidly gains community, and i thing this project will succeed in the future, and do it already right now. With new versions of Eclipse PHP IDE and Aptana, developers have, open source web development oriented IDE of the first class!
Update Dez 2015: Screenshots are lost, so removed. Article is not actual anymore, but i left it for the history…