Useful sites/services/resources/tools for learning Chinese As discussed on Meta, I think it would be great to have a collection of sites and resources for learning Chinese, so that we can all benefit from the sites, services and resources that other members find. 

Please feel free to add any site or resource you think would be of value to all members of the site.

And also, to any of the mods, please turn this question into a community wiki. Thanks!
Singchinesesongs.com

Sing Chinese Songs is a site where you can listen to Chinese music, hovering over the characters of the lyrics you can see the corresponding pinyin/meaning (as shown in the image).