ruby script/plugin install http://jsqueuespring.googlecode.com/svn/trunk/js_queue_spring/

Standard usage... executes JS page after page has loaded, similar to javascript_tag:

<% queue_js do 
	<< -STRING
		alert('Here I am, loading when the page is done.');
	STRING
end %>

Would wrap the alert in tags (and the CDATA crap), and then execute it when the page was done loading.
Note that you can (obviously?) call queue_js as many times as you like. The call will queue all JS until unqueue_js is called (which automatically happens at the end of any render call)

Alternately, you can also use pass :flat as a parameter to queue_js if you don't want your JS to automatically be executed, i.e.,

<% queue_js(:flat) do
	<< -STRING
	function someLocalFunction() {
		alert("I won't be executed until somebody calls me");
	}
	STRING
end %> 

All JS queued with the flat parameter will be added to the page before JS that will execute, so you can declare functions in the :flat areas that are called in the executed areas.

There is currently no advanced documentation for this plugin.