[H]ow do you get your skype call interviews so clear? Do you just use one of the several Skype call recorder software & record on the PC or Mac?

We've had mixed luck with Skype for recording interviews on Spark. Sometimes the quality is great. Other times... not so much.

Usually, we make Skype calls from a Windows PC in the Spark studio. Recordings are made directly into DaletPlus, the CBC's audio recording and playback software.

We've also had good luck with Audio Hijack Pro for Mac. One thing I really like about AHP is that it allows you to create stereo recordings with the interviewer on one channel, and the guest on another. This can be very handy for editing and post-processing of individual voices. If one side of the conversation is significantly louder than the other, The Levelator can help smooth things out.

For more technical details on how to get the best out of Skype interviews, here's an excellent how-to video from Doug Kaye: