Bigfeeder.com’s Mixcast is an app for streamlining the process of creating and publishing a podcast. Like Adam Curry’s CastBlaster, Mixcast lets you queue up sound effects and music for easy access while recording and seems to have a few features that CastBlaster lacks, most notably automated publishing of your podcast and RSS feed. It also lets you trigger sound effects using the keys on your numeric keypad and the UI looks considerably more intuitive — or at least informative — than CastBlaster’s. Mixcast will cost you $39 (currently discounted, compare to CastBlaster’s $50), and unfortunately there’s no free trial.