All proceeds from Side By Side go to the Japanese Tsunami Appeal and the track can be purchased from the usual online music stores as well as from Feeder's website (link attached).
However having said that I've made Side By Side single of the day because it is a bloody good track and not because it's a charity record. It's a good all round rock song with compelling lyrics and great changes of pace and feel in the arrangement. Given that it wasn't written for the appeal it's lyrics conjure up the right sentiments and if the new album is full of songs like this it should be great (Side By Side may or may not be on the album).
Feeder are an appropriate band to take a prominent position in the appeal given that bass player Taka Hirose is Japanese as is the wife of lead singer Grant Nicholas.