Could be useful but you know that will just be annoying.
America Online on Thursday said it's testing a way for AOL Instant Messenger users to send messages to a friend's cell phone--even if the recipient isn't an AOL registered consumer. America Online on Thursday said it's testing a way for AOL Instant Messenger users to send messages to a friend's cell phone--even if the recipient isn't an AOL registered consumer.

I monitor the servers I am responsible for at various jobs and SMS messaging is useful, now I will get "Wanna Hot Chat?" to my cell phone from AOL? I will just have to answer back "A/S/L?" More here