I actually had thought of this exact same idea about a year ago. Mainly as a way to learn jquery and because i look at a lot of web pages during the day and traditional bookmarking really doesnt work for me. I started adding alot of ideas onto it though and ended up dropping eventually. Are you pleanning on developing it further? Oh i was even going to use a very similiar name. :-)
Great startpage I'm trying it out. You should make the whole line clickable rather than just the text. Also I couldn't find any import option - for a service whose main selling point is having many links visible at once it would be an advantage to not have to enter them all manually. Actually this would be a great view of my delicious (or similar) bookmarks grouped by tags.
My blog post with further introductory material: <a href="http://peterlyons.com/problog/2011/03/show-hn-my-bookmarking-app/" rel="nofollow">http://peterlyons.com/problog/2011/03/show-hn-my-bookmarking...</a>
I really like the simplicity here. It solves a big problem without too much overhead.<p>One minor thought: You might consider adding a quick intro video so newcomers can see how to operate the site.