Hi, Im on the look out for a Windows based version of garage band or something close to it. I use a plethora of software to create, edit and manage the podcasts. The best editor which is very user friendly and very fast and efficient to edit with is Makepropaganda .. www.makepropaganda.com It costs $50 (about £25 to me)... but if your doing a lot of podcasts, recommend at least having a look at it.There is trial version available. Some good features.
But there still, to my knowledge is nothing that is as comprehensive as MAC User's Garageband. Love to know when there is. Audacity has all the functionality you might need, but its a bit 'clunky' to use and is not the one stop solution that Garageband provides for MAC users.. alas.