They launched a new App called Pingit that allows you to check your balance and send and receive money via only a mobile phone number.
It seems quite useful and the app works well and looks good!!
Already got nearly full stars in reviews!
Anyway only available to Barclays users until march.
They made the app for iPhone, Android and Blackberry!
I recently switched from WP7 to BB and a little part of me thought hahahahaha to WP7