you want a list of the ones im in? genrally quite good, depends on what you like to talk about and your interests, some more talkative than others, the titles say more than a description really can, any specific quations, jsut ask away. Mainly because i cant be arsed to write a description for each and everyone.

irc.codelink.info:
#code-link
#Phractured

irc.2600.net
#2600

irc.iris-network.net
#80h

irc.lug.org.uk
#linux

irc.smashthestack.org
#social

irc.happyhacker.org
#thehappyhacker

efnet (well known massive list of servers)
#crazychat
#criticalhit
#Fayolounge
#friendsunited
#help
#helpchat
#mornmorn
#ubuntu


hope something there interests you, dont hesitate to ask for info on one of them