Pretty Good, certainly useful Rated 4 out of 5 stars
Works well and allow quick and easy capture of links with additional data that are then shared or private as requried.
@Yuan WANG - you DO get a tag list. Recommended tags are shown when you bookmark also, start typing a tag and you will get matching tags from your own list. It sometimes takes a few seconds to come up if you have a slow connection. Also, the sidebar lists your tags as soon as you start to search & of course the web site itself lists all of your tags. You can also get a tag feed.