Google Labs, a place for application and tool prototypes not yet ready for primetime, has welcomed in the past few months a group of newcomers. From Google's first foray into Twitter apps to a more visual way to peruse the best blogs and articles from the web, this class of Google Labs has something to offer everyone.

1. Aardvark

AardvarkAardvark, a social search tool, was acquired by Google in February. The way it works is easy: Submit a question to the site, and in about five minutes you'll receive a response from a person in your network, instead of a list of possible answers from a search engine.

Aardvark searches through all the people in your network who are available over IM or email to find the right match for you for the specific topic. Aardvark takes into consideration related topics in peoples' profiles, how you're connected to people and more.

You can access Aardvark via the web, or through instant messenger programs (such as Google Chat, AIM, Yahoo Messenger and MSN Messenger), Twitter, iPhone and more.

2. Public Data Explorer

Google's Public Data Explorer, a data visualisation tool, aims to make datasets easy to communicate and explore. Google has compiled a list of datasets that you can explore and embed into blogs and webpages now, such as government debt in Europe, GDP and personal income of the US, mortality rates in the US and cancer cases in the US.

With these datasets, you're also able to preview how the information has changed over time, which you can customise. Take a look above at the animation that displays unemployment data for men and women in the EU.