I use Rogue Amoeba’s apps on a daily basis: Audio Hijack Pro for recording Skype calls and live podcasts, Airfoil for adding a simple graphical equalizer on top of Spotify’s output. I also put Fission through its paces a few times a month, an essential tool for quick audio edits and conversions between m4a audio and mp3.
Bottom line, great apps that have never let me down on sale for the next four days. Decent discounts as well – anywhere from 25%-67% off per application.