http://historio.us/ is free (if you have fewer than 300 bookmarks). I don't think you'll find a totally free solution, as that's basically why delicious is closing :(
Most of these sites have some free service: http://en.wikipedia.org/wiki/List_of_social_bookmarking_webs...
Where are the best free places to migrate all of your Delicious bookmarks?
------EDIT---
OK, at a minimum you can go here: https://secure.delicious.com/settings/bookmarks/export and download your entire collection (importantly... with tags). This will at least preserve your content and, since I think many of us on HN are of the technical sort, permit you to scrape the data at your leisure. You get a massive (well, in my case) definition list of elements with the following included as attributes on the item's anchor tag: the url, the add date (ADD_DATE=) the private status of the link (PRIVATE=) and the tags (TAGS=). You also get a text description. Very nice!