SoliCall, a free and small [700kb] Windows utility that lets you record audio conference calls over any IM client and it also reduces the unwanted background noise during your voice chat thereby improving voice quality.
Once installed, to record your audio chat with Solicall, set the audio settings of your messenger by pointing the Audio In (microphone) and the Audio Out (speakers) to SoliCall Audio Device. This should help you record audio chats on Skype, GTalk, Windows Live, Yahoo!, MSN Messenger, or any other VoIP client.
A big advantage of using Solicall is that you can comfortably make business calls from your computer without having to worry about the disrupting background sounds like people talking, sound of the air conditioner fan or even the keyboard ticking sound. Solicall will filter [or atleast reduce] that noise clutter for you.
Quick Tip: If the person on the other side of the audio conference call complains of hearing an echo, try turning down the volume of your microphone.