I love the goal of the makers with Hypercharts - to make financial data available to anyone. Plus, they achieve this super elegantly with a service that is as much informative as it is pleasant to use.
Simple and easy to understand.
Beautiful charts focusing on the most important data.
Has most of the companies I'm interested in.
It would be useful (for newcomers) to have a section with a glossary of the most used terms.
E.g. gross margin, CapEx, etc