If you’re not familiar already with The Chairman Bao’s website, it’s definately worth a visit but if you’re looking for an alternative – try out Deciper Chinese. Not only do they have a website, but they have apps for both Android and iPhone. Their highlighting system with pinyin and English definitions is awesome and the website lets you save words into a list of flashcards.
I come across a lot of these phrases chatting with friends on QQ. Really useful!