AI continues to develop better and more efficient versions in the 21st century.
By the early part of the 21st century, AI not only improves it's communication with humans, but with each other. Siri, for example, takes info from WolframAlpha, and uses it in it's answers.
Smart searching technology replaces conventional webpage searching, and takes info from hundreds of databases, further improving searches on the web.
Cloud computing is arguably one of the biggest expansions in the improvement of AI. Cloud computing means you can have a huge calculation done by a low-power computer. Gaming, Simulation, and many other categories are effected, and allow the everyday person, to have even the most complex calculations.