What I hate about ICQ is everything. Russian mail order brides trying to attache themselves to my contact list. People called "sXegrrrl" pretending they want to chat, but instead trying to steal your passwords. The fact that it locks XP until it's logged itself in when you dial up to the 'Net, then holds open this fucking annoying window for 30secs, telling you that you've logged in, whether you want to, or not.