Epidiascope

Simple idea:

You usually get to a site you wish to bookmark via direct search. You can use those search terms as a starting set of tags for the bookmark. This could happen automatically if you have something like google toolbar installed which tracks your searches.

If you arrive at a site several links away from a search result, the search terms may still be useful. One way to figure out if they’re useful is to figure out whether the bookmarked site would show up in a search for those terms.

Another level deeper – Even if you don’t arrive at a site via links from a search (perhaps you got a link from a friend) your search terms from around the same time period are still likely to relate to the page. Use the same trick (does the page come up in the search results for some or all of the terms?) to decide if they are related. Again, this information is available to the google toolbar.

Users don’t like to bother to tag bookmarks. Being able to search the content of the bookmarked site is nice, but tags are a powerful sorting tool that is often neglected because it doesn’t happen automatically.

Also, google bookmarks should sync back into the firefox bookmarks menu, or replace it completely.