Create bookmarklet

Hi All, I need a bookmarklet that is compatible with Firefox and Chrome - use a plugin if you wish, but if it is a plugin you'll need to keep updating it for Firefox. What I need it to do is to be able to click ONCE and have the URL that I am viewing in the browser to be submitted automatically to X number of social bookmarking sites of my choosing. The majority of these sites will require me to login so we'll need to be able to store the passwords somewhere securely. I cannot stress this enough. I want to be able to click ONCE on the bookmarklet and then to be notified once completed. Let me know what you can do, ready to start now. Thanks