If you have a bunch of del.icio.us bookmarks that you visit on a daily basis, tagged them "daily". Then go to http://del.icio.us/USERNAME/daily, click on the RSS Feed Icon (small orange square) in Navigation Toolbar, and choose "Add 'RSS feed of USERNAME's bookmarks' as Live Bookmark..." Change the name of live bookmark to "daily" and create it in Bookmarks Toolbar Folder. You will get a little orange icon on your Bookmarks Toolbar. Click on it and you will see all your del.icio.us bookmarks tagged daily. From there you can even open them all in tabs with just one click.