Built by the folks at http://FriendFeed.com Simpli.st makes and manages lists. It aims for simplicity and requires no login. Each list gets a new link for sharing and linkmarking (social bookmarking). I like it combined with the Del.icio.us Firefox add-on and “Live Bookmark” feeds of selected tags back into Firefox. Combining these two simple tools makes an even more flexible and powerful tool for managing lists.