I have been using a great bookmark synching service called FoxMarks. Whenever I add a bookmark at home, it automatically adds it to my computer at work--and vice versa. Now, FoxMarks has moved to supporting Internet Explorer instead of just FireFox, and will soon add Safari. They've changed their name to XMarks.
At the same time, they've added several services. They pool all the bookmarks from all their many users and establish a sort of vetting or rating based on how many of their users have the site bookmarked. The more people who have bookmarked a site, the higher rating it gets.
They've added the ability for their users to write reviews on any website they've bookmarked, and have the reviews available to any of their users. Finally, they work behind the scenes to grab your Google searches, and automatically annotate the Google Search Results with the sites in the search results which have been bookmarked by any XMarks users and further rank the Google search results according to their XMarks ranking.
Check it out