As of now DopplerLite 1.3 is available in the iTunes App Store. DopplerLite is the little brother of Doppler. It is a bit limited in its functionality (you can only select 5 feeds out of your total Google Reader subscription list and it is ad supported) but you can get a feeling for the functionality of the ‘big’ Doppler.

DopplerLite is free and is available here (link opens iTunes)