This is an experiment, but it seems to work.
When I see an interesting web page, article, game, video, whatever... I create a social bookmark using Delicious.com and I include the tag "science6".
I have made a special page on WikiEducator which displays the most recent eight bookmarks with the tag "science6". Every time I add new bookmarks, I know that page of links will automatically display the newer information. The content is retrieved from Delicious any time the WikiEducator page is displayed. Sometimes it take a little longer for the page to load, but there is all this extra processing each time the page displays.
This should be great for Sixth Graders, so long as there are new bookmarks being added regularly.