I just completed and published an Android application called AudioLog HD. The app records using the microphone on your Android device in high quality, up to CD-quality 16-bit 41000 Hz stereo audio. The app is available in the Android Market here:
See the listing on the market (link above) for full details on the features of the app.
I’m looking forward to any and all feedback on it, so please feel free to share your experiences here. Feature suggestions, issues, and both negative and positive feedback are all welcome. Thanks everyone! :)