It's possible to bookmark anything you're currently viewing, by simply pressing the icon in the toolbar on the bottom. A dialog will pop up, asking you if you're sure to bookmark this specific item.

Bookmarks can then be viewed again by, going to the main menu and selecting the bookmarks button: .

Bookmarks can be deleted by simply selecting them from the bookmarks page, and then clicking the icon again.

 

Personal Bookmarks are viewer independent. This means that any bookmark you make, can be viewed again on any other viewer. Even notecard urls or pictures. And any viewer can display different bookmarks for every person.

System Bookmarks are per viewer. These bookmarks can be selected and seen by anybody using the viewer, but they only show on this viewer.

So store your favorite videos, SL pictures, music streams etc. as a bookmark, and you can access them anywhere, on any viewer.