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I actually like this sort of application. It's on my list to try.
Recorder.xhead 4.0 is an audio recorder and player intended primarily for voice recording. It supports major audio formats (including AIFF, AAC, MP3, and WAV) and can record from any internal or external sound input device including a built-in internal microphone, iSight camera microphone, digital video camera microphone, or bluetooth headset. This release adds vox recording, which monitors the input source, activates recording when the input volume reaches a specified level, and stops recording once the audio level drops below a specified threshold. It also adds automatic saves at specified intervals, FTP upload, pitch control on playback, and support for RSS and for iTunes Store tags to publish podcasts. Recorder.xhead is $10 for Mac OS X 10.2 through 10.4."