We recently discontinued (HubPages internal) Bookmarks, since this was not a popularly-used feature, and we periodically trim unpopular features because each has its associated maintenance costs and adds to the complexity of the site.
If you did use Bookmarks before, however, you can now download an HTML file with them. You can easily import these bookmarks into your Web browser, or use a Web bookmarking service like Delicious. You can also just keep the file on your desktop, and open it up to click on links to your favorite Hubs.
Here is a link to your Bookmarks page. Click the Export Bookmarks as HTML button at the bottom.
Thanks for the ample warning that the feature was going away, and for creating a way to download! I'll miss having the option to bookmark, but maybe I can create a file where I store URLs of hubs I particularly want to keep at hand. Again, many thanks!
I haven't used the bookmark feature; sadly I somehow missed it. Usually if I see a hub I want to revisit I add it to my favorites on the top right corner of my screen--needless to say the list is incredibly long