Shaun,
I don't believe that there is a way to "bookmark" topics/articles/threads on Armorama specifically. I have several builds/articles/and the like bookmarked using Internet Explorer.
I have a "Modeling" folder with sub-folders named "Kit Builds," "References," and "Reviews." If one of the aforementioned topics is decidedly useful to me, it's saved in the appropriate folder.
Not much, but HTH.
Mike