HarddiskOgg takes a wave input stream from any Windows 95/98/2000/XP compatible sampling device (including microphone input and line in) and converts it to an Ogg Vorbis/Wave/Monkey's Audio/MP3 (optional) stream. This happens in realtime, so basically it is a harddisk recorder in Ogg Vorbis.

HarddiskOgg Features
Real-time encoding with bitrates from 32kbit/sec. up to 320kbit/sec.
Stereo or mono recording from 8kHz to 48kHz
Automatic numbering of output files
Can be placed in the systray and activated by a single click
Smart on-the-fly normalization for low-volume sources
Uses the high quality, patent free Ogg Vorbis encoding engine. Ogg Vorbis easily outperforms MP3 in sound quality, especially at lower bit rates.
LAME MP3 encoder compatible. However, due to patent issues HarddiskOgg ist not distributed with the LAME encoding DLL. If you want MP3 support, fetch LAME_ENC.DLL from the web, but make sure you have the appropriate rights for doing so.
Command line mode for easy integration or scheduled recordings
No fuss or stupid skinned interface, just works.