[nileshk]

In my opinion, for a bookmarking tool to be "ultimate" it at least has to store the content of the web page and allow searching the content. Basically it should be a search engine that uses your bookmarks as the source of sites to crawl. This removes the burden of having to properly tag/organize bookmarks and makes bookmarks easier to find later.

Google Bookmarks does this: https://www.google.com/bookmarks/

I've been using Google Bookmarks for years and am pretty happy with it even though it doesn't look like Google is developing it any further. There are other bookmarking products that provide this as well.