I am a student filmmaker in the UK in my final year of University, and when it comes to editing the sound from my captured footage, i use Adobe Audition.
If there is any hum, or noise in the background, there is a feature in the software called Adaptive Noise Reduction. Click this, and it quickly scans your sound clip, and removes the noise. Most of the time, I have found it has achieved the noise reduction perfectly. You can also add a Hiss Reduction if the microphone has a slight hiss.
Hope this helps, I wouldnt recommend using ventrilo for voice editing.
A free piece of software which has a few cool features also is Audacity.
All the best,
Steve