The JavaScript Unicode Character Selector makes it easy to have a closer look at the hugh number of possible unicode chars.
Visit the website on http://pklaus.github.com/js-Unicode-Selector. And this is how the app looks like:
The js-Unicode-Selector is an HTML app that uses jQuery, jQuery UI the UI plugin jQuery-SelectBox and HTML5's localStorage to make it easy to use. It is hosted on GitHub, and the source code can be found on the gh-pages branch.