There may be other techniques involved but using curve adjustment:
RGB - S curve
R : clipping at 25 and 230
G : clipping at 230
B : 0 raised to 25
Should get you pretty close
I called it lomo effect, i often do these to my photos in fact ALL.. :bsmilie:
Steps:
1) Duplicate the photo
2) on the duplicated photo, press (Apple+Shift+U) or desaturate, (I used mac OS)
3) change the layer to "Overlay"
4) play around different colour in "Photo Filter"