Sure, and I appreciate the advice, but it's not rocket science.
I already have http://www.mibbit.com/networks/ (Work in progress) which is a complete browsable list of networks and channels, with topic info etc etc. As well as being hugely useful for users, it's obviously useful for ranking on searches.
For example, if someone searches for "freenode", mibbit has some good results there.
A solid example: Search google for "freenode javascript". Mibbit is result number 3. I'm happy with that...
I repeat. SEO is not rocket science, it's simple best practices for end users.