Actually there's one more alternative. In FF3, single clicking the star in the address bar adds the URL under the "Unsorted Bookmarks" category. Note that this is not seen until you dont go into the "manage bookmarks" tool. Of late, I've been using this folder to keep my RILs.
Interesting post. I've recently moved from keeping stuff bookmarked to using the "Read it later" add-on. That combined with FF3s smart bookmarks is probably the easiest way to manage my RILs :)