http://colas.nahaboo.net/Software/IrcLogger irclogger is a simple "bot", a program connecting as a client on IRC servers to provide a web log of what is said. It aims to provide a simple, fast, efficient and web-compliant service. It is quite robust and mature, having be in daily heavy use for personal & business use since 2003.
I have migrated its page this new site, and I just released a minor release for it, 1.14b that fixes a log "off by 1" bug when selecting a search result. If you use irclogger, upgrade is recommended.