If you are looking for the official Google Talk or GTalk client in the Apple App Store then I am afraid, you won't find one as Google does not have a chat client for the iOS platform (iPad, iPhone, iPod). All it offers is the web based interface for chat which is so not nice to use. In this article we will tell you about an app called IM+ which one of the best free applications on the app store for using Google Talk on the iPad.
The app is available in both Free and Paid versions. The free version is decent enough for regular chatting unless you require some funky features like voice recognition which is only offered by the paid version. In order to download the free version of IM+, you can use the following links on your iPad.
IM+ Free Version: itunes.apple.com/us/app/im-lite/id285688934?mt=8
IM+ Paid Version: itunes.apple.com/app/id296246130?mt=8 (US $9.99 - For those who want the extra features)
Here are some screen shots of the IM+ app at action on the iPad: