I have noticed that the voicing system is used in Bitlbee to let me know wich users are availlable, instead of being away, DND or simply NA. So, my next ERC modding will have to be a notification, to let me know what's the status of my so-called "friends".
Also, I have to check erc-bbdb to know the current MSN nick of a particular buddy. I know they do this on /WHOIS, so i'l just grok that and make it into a popup message in erc-nicklist, or something.
Btw, I just came across C-M-w in Emacs. The kill ring still amazes me! (Go on, check it...)