Sprite Navigation Generator: Nav-o-Matic

We know that using CSS sprites has a very positive effect on website speed by decreasing the amount of HTTP requests.

Nav-o-Matic is a free online service which makes generating navigation sprites easier.

It simply asks you to upload the image of the navigation which has 2 rows (for normal and hover states, like this one), add your guides, define the CSS/image folders and you're done.