Unfortunately, the current version does not support collapsible sections. You may find that longer articles can be a long wall of text which can mean losing track of your position relative to other sections. Navigation itself is not impacted, since most Wiki pages offer the ability to jump to a section from the top of the page with a single click. Wapedia also does smart auto-complete of article titles which can save you a significant amount of typing on the myTouch’s soft keyboard. In addition to collapsible section headers, features that you might miss right now include the ability to switch to a text-only mode (which can significantly speed up the application), and the ability to bookmark articles for later reference. Overall, this is a wonderful app for browsing Wikipedia in a fast, clean, and intuitive manner.