Just thought I would let you guys know that Rush is out on the App Store for iPhone.
http://rushapp.com
So far it doesn't work very well for me. It just sits there trying to load forever when I open an email and it also endlessly loads when I try to sign in for the chat feature. Also there is no place for me to report bugs or contact support.
@colinmarshall Hi there, thanks for your support. Rush is still in its infancy and we're trying every effort to make it better. Your feedbacks are greatly appreciated. You can send us an email at contact@rush.im, or give us a shout on Twitter at @getrushapp.