My experience with sending SMS messages to mobile phones over aim has been spotty. Sometimes the "phone number" appears to be online, sometimes it does not. Sometimes the message goes through, sometimes it does not. It would be awesome if this was more uniform, like making phone numbers a whole different type of screen name. Also, it would be cool if there was some way of handling the phone numbers in the contact list -- the extreme example would be to have tabs -- one with contacts and one with phone numbers -- I am still undecided as to whether I want this, but it is just meant to start the thinking on ways to handle phone numbers in adium.
Also, thanks so much for this program. It is freakin awesome! Keep up the great work.