Syntax highlighting makes code structures pop up, puts order into the intricacies of a program, let’s you concentrate on the logical connections.
Chili does a great job. If you are a blog author, you can easily add syntax highlighting to your scripts, even if you have a very limited control on page generation. And Chili does offer you many configuration options, including the possibility to adapt color schemes at your taste. In fact, the CSS for a language is maybe the first thing Chili users change. They want their highlighting to suit their vision, they build a pattern that matches their engine.
HotChili is better. If you are a blog reader, you can easily* add syntax highlighting to scripts that are not yours, even if they are already highlighted. Pretty cool: you can adapt almost any script to your color scheme!!
* (two clicks)