This site is more on general Internet chatting than IRC specifically, but may still be of interest. A pile of links on anything IRC-related. This site contains and links to a large number of documents on a large number of IRC-related subjects. Also has a scripts section. Hiersay Various articles on IRC, etc.
Site is in French.
The Home of Kingfisher A nice home page with an IRC section with a number of scripts, lots of links, and a lot of general IRC informational resources. An introduction to IRC using the mIRC client, covering everything from first steps to basic scripting. Has a lot of good information, especially for the newbie, with lots of helpful pictures, etc. Wasn't sure if it fit into 'general IRC', but it has enough non-mIRC specific info that this could be helpful to anyone with any client. This site proposes to help you find people that you've 'lost' on IRC, because they've changed networks or nicknames.