This time is erc-image and erc-tweet's little brother: erc-youtube.
Sometimes, when someone posts a youtube link in an IRC channel, you feel like clicking, but from time to time it's some link you really wouldn't like to have clicked. And it's too late.
Erc-youtube will inline the video's title in the erc buffer so you can decide then if you want to click or not.
Supersimple plugin, but it may be useful for some of you. Shortly it'll be in melpa.