I always struggled to find a free Chat application for my N series and E series Nokia devices, but finally i have got one, well its not the nimbuzz, this time its from Nokia itself, with support for Yahoo,Google Talk and Live Messenger, Nokia Messaging – IM Beta is an extremely slick and powerful chat tool. This can be downloaded from Nokia beta site for free of cost.
http://betalabs.nokia.com/apps/nokia-messaging-chat
This beta is available for Nokia E75, E71 , E72 and E63, and it works with Yahoo!® Messenger, Google Talk and Ovi accounts.