I've been using Queen Beecon for quite some time now and I consider this to be the #1 application for the N900.
It's a flexible, efficient method to create GUIs of which you know exactly what they do and how they perform.

I still prefer to write proper scripts and launch them in Xterm for complex tasks, but QBW is great for the smaller things which you activate and deactive often.

Thank you, No!No!No!Yes!.
You're a valuable member of the Maemo-community and I believe you should be treated as one way more often.

Edit:
New screenshot. + Changed the layout of the post.