Bookmarklet Loader is a template bookmarklet that injects a .js and .css link into the current page.
Pinterest and Instapaper use similar implementations to load their bookmarklet code.
Update the following in 'bookmarklet-loader.js.coffee' to refer to your app's .js and .css. If you don't want to include both a .js or .css, you can pass 'null' instead of a url for either.
loader = new BookmarkletLoader 'yourApp',
'http://example.com/your-app.js',
'http://example.com/your-app.css'
Bookmarklet Loader is written in CoffeeScript, however bookmarklets must be JavaScript and URL encoded. CoffeeMarklet does a great job of converting CoffeeScript to bookmarklet-friendly JavaScript. I recommend you use it to generate your bookmarklet.
Contact me if you have a question-- Matt's Blog.