This weekend, I finished the first portion of my bookmarklet for the Inn.ocuo.us website. Currently, there are really only two users. Myself and @LauraVezer.
I thought I would create a bookmarklet so that I can more quickly post links to twitter using my own shortener. And now it works.
The next step will be for me to enable session tracking and allow other users to start using the bookmarklet and other features. Basically you use click on the bookmarklet, which will open the page you're on inside an iframe that contains an input box to modify what you're going to tweet, you modify your tweet, then click submit. It will post your tweet update, then redirect you back to the page you were just looking at so you can continue browsing.
I might change this from a window to inserting a floating div into the current page, but we shall see.