If you want to share URLs with your students, tag your del.icio.us bookmarks with a module code. If you publish the link to the tag, your students will get up-to-date access to your links and it’s easy for you to add more. I find it much more more flexible and convenient than the External links feature in Blackboard! You can even create an RSS feed for your links!
Here’s one I made earlier: del.icio.us/cpjobling/eg-146.