http://dl.dropbox.com/u/216352/what-do-I-have-to-do-next.png

("Co mam zrobić dalej?" is "What do I have to do next?" in Polish)

This single feature simplified the whole otherwise complicated formal process to simple "click the link, read what to do, do it, repeat" process. After you completed one set of actions, new instructions were waiting under the link. For me, those instructions perfectly matched the thought process I had in my head and answered every question at the right time. Of course, all relevant formal data was available for all the time by clicking on other links. They also got the trust issue right - the "What to do" link, along with an action list, shown all the relevant context, so at any point in time one could be 100% sure what to do, and that one is not missing anything important.

Thought I'd share ;).