According to Create Digital Music an experienced Pro Tools developer named Alex le Lievre has managed to hack together a Pro Tools LE remote using his iPhone. As you can see from the above video the remote allows him to control Pro Tools and get live feedback from it on an iPhone or iPod touch. Alex is not releasing the software yet because he wants to sell it come February when the iPhone SDK is released "if Apple lets [him] once they certify [his] code." In any case, just getting this to work is rather impressive. There are more details at Create Digial Music.