This is great and a total no-brainer, very comfortable. I know there are a couple of solutions out there including command line based ones (also within Grunt and Compass), but this has been the most usable for me yet.
http://spritecssgenerator.formfcw.com/
You can name your symbols like css selectors, and of course use Sass with it too.
I name my symbols like this (Sass placeholders):
%sprite-next
%sprite-next:hover
%sprite-prev
%sprite-prev:hover
and so on, and then I extend my desired elements like this:
.my-element {
@extend %sprite-next;
}
It even summarizes symbols with same sizes into single selectors.