Foxylicious is a Mozilla Firefox extension that integrates your del.icio.us bookmarks into your browser bookmarks. The first time you use it, it will import all your del.icio.us bookmarks, and separate them by tag into bookmark folders. Subsequent imports
Wikalong is a FirefoxExtension that embeds a wiki in the SideBar of your browser, indexed off the url of your current page. It is probably most simply described as a wiki-margin for the internet.