Minou chat Chat is a web application for the iPhone and iTouch that allows you to chat in different discussion-rooms. Among its features are the fact that it is very light so it does not consume a lot of battery.
The app also contains a number of games in IRC style.
One of the nice other options you have, is the possibility to create your own chat rooms.

» A chat for iPhone

The Wikipedia web application lets you easily read, search and browse Wikipedia articles right on your iPhone or iPod Touch. The application formats the articles perfectly for the iPhone’s display, and evenallows you to save articles for off line viewing.