Awesome

ETH-Balance-Graph

Create a graph of the ETH balance over time of an Ethereum address

You can play with this app here: http://shawntabrizi.com/ethgraph/

Tutorial on making Parellel Asynchronous Web3.js calls here: Blog

Check out other simple Web3.js samples

https://github.com/shawntabrizi/ETH-Balance

https://github.com/shawntabrizi/ERC-20-Token-Balance