Just to all let you know that you can hear some previews of the Kiiroi Namida Soundtrack on J-Storm here, including, of course, the two Arashi Songs!

もどり雨 (Modori Ame)
涙の流れ星 (Namida no nagareboshi)

The previews are only 15 seconds long ;^; But for those who are willing to listen to them on loop like mad like me, I've extracted them and uploaded the MP3s on Megaupload :3

Thanks to Jen's Blog for the tip!