[EDIT 23AUG13 - I withdraw my suggestion having gained a bit more experience here, and will provide my own answer (of several possible) (The downvotes one way or the other are of no concern :)) ]
Most hit Stack Overflow (and other Stack Exchange sites) with a specific problem at hand. We search for example code or for possible related answers. The process I use is probably like most: google the question or search here, review the search results and pick the question that seems closest. Then we read it, perhaps review Similar Questions (or tags) ... wash, rinse, repeat.
All that works great --- until later when you have to refind that stack of Stack Overflow answers. This can easily happen when the problem is multifaceted.
Yes, understood there is a history in our profiles, and yes, we can save the links... Or, what I do, bookmark the initial entry point and later recurse through the whole list again. Ugh.
[Edit - after some comments received ] - I forgot to mention that this flagged trail could be kept as a breadcrumb trail for others to follow. Certainly I can bookmark or save tabs in my browser - but how would you then know where I went? Isn't Stack Overflow partly to help prevent reinvention of the wheel? The problems are often similar enough that following where others have searched would make things easier.