I combined a couple of examples from the
book to create Feed Poster, a program that checks a list of newsfeeds, composes a blog post listing the items from those newsfeeds posted in the last X days. You could use it, for example, to post a summary of your del.icio.us links at the end of each day. I considered using David Czarnecki's
Java API for del.icio.us, which looks awesome, but I ended up using a simple newsfeed parser and blog client instead.