Well-Presented HTML Entities: EntityCode
HTML entities (character references) which are used to define reserved characters or to express characters that cannot easily be entered with the keyboard are generally hard to remember.
EntityCode is a website that lists HTML entities in an easy-to-find format. Rather than a long list of entities, they are simply grouped like currency, math, direction, etc.
A must-bookmark for every web designer & developer.
Website: http://www.entitycode.com/