Vander Wal has written a combination bookmarklet for both networks, which takes two of my favorite bookmarklets (for del.icio.us and Yahoo MyWeb 2, put them in a javascript collider to get a United Tag Tool (drag this to your browser's bookmark bar).
By clicking on this bookmarklet you get the del.icio.us tag interface populated with the title. You also get a MyWeb entry pop-up window.
I wonder whether there's rel="tag" attributes in there, which would make it good for technorati too..... Investigating.
Filed in: MyWeb, Yahoo, del.icio.us, Webtech, blogtech