This tank can be composed with a tank of your own to provide bookmarking capabilities using a handy little bookmarklet.
To make it work, create a comp. When you visit the app page you will be presented with a custom bookmarklet (the bookmar icon) to add to your browser.
As with the TiddlySpace system this will not work on all websites. If something doesn't work please look in the browser's console for possible error messages and let me know. You can see some of my test bookmarks for a sample.