Since we are developing multeem at the moment it should be interesting for you to know that there is a cool IRC client for Windows Mobile 5.0.
for Pocket PC…
…and for Smartphone
“wmIRC is one of the first IRC (Internet Relay Chat) client for Windows Mobile that works on both Smartphone and Pocket PC devices. With clear and straightforward user interface wmIRC is much faster and easier to use than it’s competitors. wmIRC contains only the required and minimum set of functionality, so that even novice IRC users can work with it without any problems. wmIRC is optimized for mobile IRC users who use IRC messaging a lot. It has much nice features, that can make IRC chatting with your Microsoft Windows Mobile gadget a bliss!”