I really thought that I was done producing new Flex widgets but there was a thread discussing the need for a Bookmark Widget that would allow you to group and organize Bookmarks, so I though what the heck one more won't hurt.
This enhanced bookmark widget uses a hierarchical data structure in a tree, so that you can nest or group bookmarks
to have them easier to find and organize. It takes all that the default OTB Bookmark widget does and allows you to organize your bookmarks into groups.
Hope that it is useful to you.