This is kind of an old thread at this point for two reasons:
1. SD Card for Android OS 2.2 has been supported for some time.
2. App went on a diet and lost 3 times it's weight. Now sits at under 8 megabytes.
So hopefully your phone manufacter will update your OS to 2.2 so you get the option of SD card app installs but even if not you get the benifit of White Noise taking less than 8 megs.
If you have issues upgrading, just uninstall the app first then download again. You don't get charged twice. Thanks everyone for all the feedback. I hope you appreciate all the hard work that has gone into the latest version.