Icon Fonts
IcoMoon is a web app that creates fonts. These fonts are little different to the type you would normally use in a word processor, these fonts contain icons that can be used throughout your website. This is another size saving tool, a font file is smaller than storing lots of little images (yes you could use a sprite). The benefits of using a font is that they will scale to almost any size and will still look good, the downside is that a fonts are monochrome.